mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-21 23:10:13 +00:00
1034 lines
33 KiB
C
1034 lines
33 KiB
C
/*
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* AVI demuxer
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* Copyright (c) 2001 Fabrice Bellard.
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include "avi.h"
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#include "dv.h"
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#include "riff.h"
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#undef NDEBUG
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#include <assert.h>
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//#define DEBUG
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//#define DEBUG_SEEK
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typedef struct AVIStream {
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int64_t frame_offset; /* current frame (video) or byte (audio) counter
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(used to compute the pts) */
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int remaining;
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int packet_size;
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int scale;
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int rate;
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int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
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int64_t cum_len; /* temporary storage (used during seek) */
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int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
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int prefix_count;
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} AVIStream;
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typedef struct {
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int64_t riff_end;
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int64_t movi_end;
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int64_t fsize;
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offset_t movi_list;
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int index_loaded;
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int is_odml;
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int non_interleaved;
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int stream_index;
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DVDemuxContext* dv_demux;
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} AVIContext;
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static const char avi_headers[][8] = {
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{ 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
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{ 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
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{ 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19},
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{ 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
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{ 0 }
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};
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static int avi_load_index(AVFormatContext *s);
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static int guess_ni_flag(AVFormatContext *s);
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#ifdef DEBUG
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static void print_tag(const char *str, unsigned int tag, int size)
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{
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printf("%s: tag=%c%c%c%c size=0x%x\n",
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str, tag & 0xff,
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(tag >> 8) & 0xff,
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(tag >> 16) & 0xff,
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(tag >> 24) & 0xff,
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size);
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}
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#endif
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static int get_riff(AVIContext *avi, ByteIOContext *pb)
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{
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char header[8];
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int i;
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/* check RIFF header */
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get_buffer(pb, header, 4);
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avi->riff_end = get_le32(pb); /* RIFF chunk size */
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avi->riff_end += url_ftell(pb); /* RIFF chunk end */
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get_buffer(pb, header+4, 4);
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for(i=0; avi_headers[i][0]; i++)
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if(!memcmp(header, avi_headers[i], 8))
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break;
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if(!avi_headers[i][0])
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return -1;
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if(header[7] == 0x19)
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av_log(NULL, AV_LOG_INFO, "file has been generated with a totally broken muxer\n");
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return 0;
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}
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static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
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AVIContext *avi = s->priv_data;
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ByteIOContext *pb = &s->pb;
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int longs_pre_entry= get_le16(pb);
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int index_sub_type = get_byte(pb);
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int index_type = get_byte(pb);
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int entries_in_use = get_le32(pb);
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int chunk_id = get_le32(pb);
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int64_t base = get_le64(pb);
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int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
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AVStream *st;
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AVIStream *ast;
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int i;
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int64_t last_pos= -1;
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int64_t filesize= url_fsize(&s->pb);
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#ifdef DEBUG_SEEK
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av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
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longs_pre_entry,index_type, entries_in_use, chunk_id, base);
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#endif
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if(stream_id > s->nb_streams || stream_id < 0)
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return -1;
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st= s->streams[stream_id];
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ast = st->priv_data;
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if(index_sub_type)
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return -1;
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get_le32(pb);
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if(index_type && longs_pre_entry != 2)
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return -1;
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if(index_type>1)
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return -1;
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if(filesize > 0 && base >= filesize){
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av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
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if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
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base &= 0xFFFFFFFF;
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else
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return -1;
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}
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for(i=0; i<entries_in_use; i++){
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if(index_type){
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int64_t pos= get_le32(pb) + base - 8;
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int len = get_le32(pb);
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int key= len >= 0;
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len &= 0x7FFFFFFF;
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#ifdef DEBUG_SEEK
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av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
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#endif
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if(last_pos == pos || pos == base - 8)
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avi->non_interleaved= 1;
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else
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av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0);
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if(ast->sample_size)
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ast->cum_len += len;
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else
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ast->cum_len ++;
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last_pos= pos;
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}else{
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int64_t offset, pos;
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int duration;
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offset = get_le64(pb);
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get_le32(pb); /* size */
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duration = get_le32(pb);
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pos = url_ftell(pb);
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url_fseek(pb, offset+8, SEEK_SET);
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read_braindead_odml_indx(s, frame_num);
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frame_num += duration;
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url_fseek(pb, pos, SEEK_SET);
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}
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}
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avi->index_loaded=1;
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return 0;
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}
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static void clean_index(AVFormatContext *s){
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int i;
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int64_t j;
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for(i=0; i<s->nb_streams; i++){
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AVStream *st = s->streams[i];
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AVIStream *ast = st->priv_data;
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int n= st->nb_index_entries;
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int max= ast->sample_size;
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int64_t pos, size, ts;
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if(n != 1 || ast->sample_size==0)
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continue;
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while(max < 1024) max+=max;
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pos= st->index_entries[0].pos;
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size= st->index_entries[0].size;
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ts= st->index_entries[0].timestamp;
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for(j=0; j<size; j+=max){
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av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
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}
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}
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}
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static int avi_read_tag(ByteIOContext *pb, char *buf, int maxlen, unsigned int size)
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{
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offset_t i = url_ftell(pb);
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size += (size & 1);
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get_strz(pb, buf, maxlen);
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url_fseek(pb, i+size, SEEK_SET);
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return 0;
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}
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static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
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{
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AVIContext *avi = s->priv_data;
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ByteIOContext *pb = &s->pb;
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uint32_t tag, tag1, handler;
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int codec_type, stream_index, frame_period, bit_rate;
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unsigned int size, nb_frames;
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int i;
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AVStream *st;
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AVIStream *ast = NULL;
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char str_track[4];
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avi->stream_index= -1;
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if (get_riff(avi, pb) < 0)
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return -1;
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avi->fsize = url_fsize(pb);
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if(avi->fsize<=0)
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avi->fsize= avi->riff_end;
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/* first list tag */
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stream_index = -1;
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codec_type = -1;
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frame_period = 0;
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for(;;) {
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if (url_feof(pb))
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goto fail;
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tag = get_le32(pb);
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size = get_le32(pb);
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#ifdef DEBUG
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print_tag("tag", tag, size);
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#endif
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switch(tag) {
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case MKTAG('L', 'I', 'S', 'T'):
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/* ignored, except when start of video packets */
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tag1 = get_le32(pb);
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#ifdef DEBUG
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print_tag("list", tag1, 0);
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#endif
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if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
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avi->movi_list = url_ftell(pb) - 4;
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if(size) avi->movi_end = avi->movi_list + size + (size & 1);
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else avi->movi_end = url_fsize(pb);
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#ifdef DEBUG
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printf("movi end=%"PRIx64"\n", avi->movi_end);
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#endif
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goto end_of_header;
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}
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break;
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case MKTAG('d', 'm', 'l', 'h'):
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avi->is_odml = 1;
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url_fskip(pb, size + (size & 1));
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break;
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case MKTAG('a', 'v', 'i', 'h'):
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/* avi header */
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/* using frame_period is bad idea */
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frame_period = get_le32(pb);
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bit_rate = get_le32(pb) * 8;
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get_le32(pb);
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avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
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url_fskip(pb, 2 * 4);
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get_le32(pb);
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url_fskip(pb, size - 7 * 4);
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break;
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case MKTAG('s', 't', 'r', 'h'):
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/* stream header */
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tag1 = get_le32(pb);
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handler = get_le32(pb); /* codec tag */
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if(tag1 == MKTAG('p', 'a', 'd', 's')){
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url_fskip(pb, size - 8);
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break;
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}else{
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stream_index++;
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st = av_new_stream(s, stream_index);
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if (!st)
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goto fail;
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ast = av_mallocz(sizeof(AVIStream));
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if (!ast)
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goto fail;
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st->priv_data = ast;
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}
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#ifdef DEBUG
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print_tag("strh", tag1, -1);
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#endif
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if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
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int64_t dv_dur;
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/*
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* After some consideration -- I don't think we
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* have to support anything but DV in a type1 AVIs.
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*/
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if (s->nb_streams != 1)
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goto fail;
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if (handler != MKTAG('d', 'v', 's', 'd') &&
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handler != MKTAG('d', 'v', 'h', 'd') &&
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handler != MKTAG('d', 'v', 's', 'l'))
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goto fail;
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ast = s->streams[0]->priv_data;
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av_freep(&s->streams[0]->codec->extradata);
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av_freep(&s->streams[0]);
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s->nb_streams = 0;
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if (ENABLE_DV_DEMUXER) {
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avi->dv_demux = dv_init_demux(s);
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if (!avi->dv_demux)
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goto fail;
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}
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s->streams[0]->priv_data = ast;
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url_fskip(pb, 3 * 4);
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ast->scale = get_le32(pb);
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ast->rate = get_le32(pb);
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url_fskip(pb, 4); /* start time */
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dv_dur = get_le32(pb);
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if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
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dv_dur *= AV_TIME_BASE;
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s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
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}
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/*
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* else, leave duration alone; timing estimation in utils.c
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* will make a guess based on bit rate.
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*/
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stream_index = s->nb_streams - 1;
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url_fskip(pb, size - 9*4);
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break;
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}
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assert(stream_index < s->nb_streams);
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st->codec->stream_codec_tag= handler;
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get_le32(pb); /* flags */
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get_le16(pb); /* priority */
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get_le16(pb); /* language */
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get_le32(pb); /* initial frame */
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ast->scale = get_le32(pb);
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ast->rate = get_le32(pb);
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if(ast->scale && ast->rate){
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}else if(frame_period){
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ast->rate = 1000000;
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ast->scale = frame_period;
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}else{
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ast->rate = 25;
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ast->scale = 1;
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}
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av_set_pts_info(st, 64, ast->scale, ast->rate);
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ast->cum_len=get_le32(pb); /* start */
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nb_frames = get_le32(pb);
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st->start_time = 0;
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st->duration = nb_frames;
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get_le32(pb); /* buffer size */
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get_le32(pb); /* quality */
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ast->sample_size = get_le32(pb); /* sample ssize */
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ast->cum_len *= FFMAX(1, ast->sample_size);
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// av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
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switch(tag1) {
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case MKTAG('v', 'i', 'd', 's'):
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codec_type = CODEC_TYPE_VIDEO;
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ast->sample_size = 0;
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break;
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case MKTAG('a', 'u', 'd', 's'):
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codec_type = CODEC_TYPE_AUDIO;
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break;
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case MKTAG('t', 'x', 't', 's'):
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//FIXME
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codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
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break;
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default:
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av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
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goto fail;
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}
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ast->frame_offset= ast->cum_len;
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url_fskip(pb, size - 12 * 4);
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break;
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case MKTAG('s', 't', 'r', 'f'):
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/* stream header */
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if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
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url_fskip(pb, size);
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} else {
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st = s->streams[stream_index];
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switch(codec_type) {
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case CODEC_TYPE_VIDEO:
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get_le32(pb); /* size */
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st->codec->width = get_le32(pb);
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st->codec->height = get_le32(pb);
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get_le16(pb); /* panes */
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st->codec->bits_per_sample= get_le16(pb); /* depth */
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tag1 = get_le32(pb);
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get_le32(pb); /* ImageSize */
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get_le32(pb); /* XPelsPerMeter */
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get_le32(pb); /* YPelsPerMeter */
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get_le32(pb); /* ClrUsed */
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get_le32(pb); /* ClrImportant */
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|
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if (tag1 == MKTAG('D', 'X', 'S', 'B')) {
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st->codec->codec_type = CODEC_TYPE_SUBTITLE;
|
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st->codec->codec_tag = tag1;
|
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st->codec->codec_id = CODEC_ID_XSUB;
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break;
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}
|
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|
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if(size > 10*4 && size<(1<<30)){
|
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st->codec->extradata_size= size - 10*4;
|
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st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
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get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
|
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}
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|
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if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
|
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get_byte(pb);
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|
|
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/* Extract palette from extradata if bpp <= 8 */
|
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/* This code assumes that extradata contains only palette */
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|
/* This is true for all paletted codecs implemented in ffmpeg */
|
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if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
|
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st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
|
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#ifdef WORDS_BIGENDIAN
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for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
|
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st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
|
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#else
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memcpy(st->codec->palctrl->palette, st->codec->extradata,
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FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
|
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#endif
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st->codec->palctrl->palette_changed = 1;
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}
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|
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#ifdef DEBUG
|
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print_tag("video", tag1, 0);
|
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#endif
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st->codec->codec_type = CODEC_TYPE_VIDEO;
|
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st->codec->codec_tag = tag1;
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st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
|
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st->need_parsing = AVSTREAM_PARSE_HEADERS; // this is needed to get the pict type which is needed for generating correct pts
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// url_fskip(pb, size - 5 * 4);
|
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break;
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case CODEC_TYPE_AUDIO:
|
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get_wav_header(pb, st->codec, size);
|
|
if(ast->sample_size && st->codec->block_align && ast->sample_size % st->codec->block_align)
|
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av_log(s, AV_LOG_DEBUG, "invalid sample size or block align detected\n");
|
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if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
|
|
url_fskip(pb, 1);
|
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/* Force parsing as several audio frames can be in
|
|
* one packet and timestamps refer to packet start*/
|
|
st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
|
|
/* ADTS header is in extradata, AAC without header must be stored as exact frames, parser not needed and it will fail */
|
|
if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
|
|
st->need_parsing = AVSTREAM_PARSE_NONE;
|
|
/* AVI files with Xan DPCM audio (wrongly) declare PCM
|
|
* audio in the header but have Axan as stream_code_tag. */
|
|
if (st->codec->stream_codec_tag == ff_get_fourcc("Axan")){
|
|
st->codec->codec_id = CODEC_ID_XAN_DPCM;
|
|
st->codec->codec_tag = 0;
|
|
}
|
|
break;
|
|
default:
|
|
st->codec->codec_type = CODEC_TYPE_DATA;
|
|
st->codec->codec_id= CODEC_ID_NONE;
|
|
st->codec->codec_tag= 0;
|
|
url_fskip(pb, size);
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
case MKTAG('i', 'n', 'd', 'x'):
|
|
i= url_ftell(pb);
|
|
if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
|
|
read_braindead_odml_indx(s, 0);
|
|
}
|
|
url_fseek(pb, i+size, SEEK_SET);
|
|
break;
|
|
case MKTAG('I', 'N', 'A', 'M'):
|
|
avi_read_tag(pb, s->title, sizeof(s->title), size);
|
|
break;
|
|
case MKTAG('I', 'A', 'R', 'T'):
|
|
avi_read_tag(pb, s->author, sizeof(s->author), size);
|
|
break;
|
|
case MKTAG('I', 'C', 'O', 'P'):
|
|
avi_read_tag(pb, s->copyright, sizeof(s->copyright), size);
|
|
break;
|
|
case MKTAG('I', 'C', 'M', 'T'):
|
|
avi_read_tag(pb, s->comment, sizeof(s->comment), size);
|
|
break;
|
|
case MKTAG('I', 'G', 'N', 'R'):
|
|
avi_read_tag(pb, s->genre, sizeof(s->genre), size);
|
|
break;
|
|
case MKTAG('I', 'P', 'R', 'D'):
|
|
avi_read_tag(pb, s->album, sizeof(s->album), size);
|
|
break;
|
|
case MKTAG('I', 'P', 'R', 'T'):
|
|
avi_read_tag(pb, str_track, sizeof(str_track), size);
|
|
sscanf(str_track, "%d", &s->track);
|
|
break;
|
|
default:
|
|
if(size > 1000000){
|
|
av_log(s, AV_LOG_ERROR, "well something went wrong during header parsing, "
|
|
"ill ignore it and try to continue anyway\n");
|
|
avi->movi_list = url_ftell(pb) - 4;
|
|
avi->movi_end = url_fsize(pb);
|
|
goto end_of_header;
|
|
}
|
|
/* skip tag */
|
|
size += (size & 1);
|
|
url_fskip(pb, size);
|
|
break;
|
|
}
|
|
}
|
|
end_of_header:
|
|
/* check stream number */
|
|
if (stream_index != s->nb_streams - 1) {
|
|
fail:
|
|
for(i=0;i<s->nb_streams;i++) {
|
|
av_freep(&s->streams[i]->codec->extradata);
|
|
av_freep(&s->streams[i]);
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
if(!avi->index_loaded && !url_is_streamed(pb))
|
|
avi_load_index(s);
|
|
avi->index_loaded = 1;
|
|
avi->non_interleaved |= guess_ni_flag(s);
|
|
if(avi->non_interleaved)
|
|
clean_index(s);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
AVIContext *avi = s->priv_data;
|
|
ByteIOContext *pb = &s->pb;
|
|
int n, d[8], size;
|
|
offset_t i, sync;
|
|
void* dstr;
|
|
|
|
if (ENABLE_DV_DEMUXER && avi->dv_demux) {
|
|
size = dv_get_packet(avi->dv_demux, pkt);
|
|
if (size >= 0)
|
|
return size;
|
|
}
|
|
|
|
if(avi->non_interleaved){
|
|
int best_stream_index = 0;
|
|
AVStream *best_st= NULL;
|
|
AVIStream *best_ast;
|
|
int64_t best_ts= INT64_MAX;
|
|
int i;
|
|
|
|
for(i=0; i<s->nb_streams; i++){
|
|
AVStream *st = s->streams[i];
|
|
AVIStream *ast = st->priv_data;
|
|
int64_t ts= ast->frame_offset;
|
|
|
|
if(ast->sample_size)
|
|
ts /= ast->sample_size;
|
|
ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
|
|
|
|
// av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
|
|
if(ts < best_ts){
|
|
best_ts= ts;
|
|
best_st= st;
|
|
best_stream_index= i;
|
|
}
|
|
}
|
|
best_ast = best_st->priv_data;
|
|
best_ts= av_rescale(best_ts, best_st->time_base.den, AV_TIME_BASE * (int64_t)best_st->time_base.num); //FIXME a little ugly
|
|
if(best_ast->remaining)
|
|
i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
|
|
else
|
|
i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
|
|
|
|
// av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
|
|
if(i>=0){
|
|
int64_t pos= best_st->index_entries[i].pos;
|
|
pos += best_ast->packet_size - best_ast->remaining;
|
|
url_fseek(&s->pb, pos + 8, SEEK_SET);
|
|
// av_log(NULL, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
|
|
|
|
assert(best_ast->remaining <= best_ast->packet_size);
|
|
|
|
avi->stream_index= best_stream_index;
|
|
if(!best_ast->remaining)
|
|
best_ast->packet_size=
|
|
best_ast->remaining= best_st->index_entries[i].size;
|
|
}
|
|
}
|
|
|
|
resync:
|
|
if(avi->stream_index >= 0){
|
|
AVStream *st= s->streams[ avi->stream_index ];
|
|
AVIStream *ast= st->priv_data;
|
|
int size;
|
|
|
|
if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
|
|
size= INT_MAX;
|
|
else if(ast->sample_size < 32)
|
|
size= 64*ast->sample_size;
|
|
else
|
|
size= ast->sample_size;
|
|
|
|
if(size > ast->remaining)
|
|
size= ast->remaining;
|
|
av_get_packet(pb, pkt, size);
|
|
|
|
if (ENABLE_DV_DEMUXER && avi->dv_demux) {
|
|
dstr = pkt->destruct;
|
|
size = dv_produce_packet(avi->dv_demux, pkt,
|
|
pkt->data, pkt->size);
|
|
pkt->destruct = dstr;
|
|
pkt->flags |= PKT_FLAG_KEY;
|
|
} else {
|
|
/* XXX: how to handle B frames in avi ? */
|
|
pkt->dts = ast->frame_offset;
|
|
// pkt->dts += ast->start;
|
|
if(ast->sample_size)
|
|
pkt->dts /= ast->sample_size;
|
|
//av_log(NULL, AV_LOG_DEBUG, "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d base:%d st:%d size:%d\n", pkt->dts, ast->frame_offset, ast->scale, ast->rate, ast->sample_size, AV_TIME_BASE, avi->stream_index, size);
|
|
pkt->stream_index = avi->stream_index;
|
|
|
|
if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
|
|
AVIndexEntry *e;
|
|
int index;
|
|
assert(st->index_entries);
|
|
|
|
index= av_index_search_timestamp(st, pkt->dts, 0);
|
|
e= &st->index_entries[index];
|
|
|
|
if(index >= 0 && e->timestamp == ast->frame_offset){
|
|
if (e->flags & AVINDEX_KEYFRAME)
|
|
pkt->flags |= PKT_FLAG_KEY;
|
|
}
|
|
} else {
|
|
pkt->flags |= PKT_FLAG_KEY;
|
|
}
|
|
if(ast->sample_size)
|
|
ast->frame_offset += pkt->size;
|
|
else
|
|
ast->frame_offset++;
|
|
}
|
|
ast->remaining -= size;
|
|
if(!ast->remaining){
|
|
avi->stream_index= -1;
|
|
ast->packet_size= 0;
|
|
}
|
|
|
|
return size;
|
|
}
|
|
|
|
memset(d, -1, sizeof(int)*8);
|
|
for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
|
|
int j;
|
|
|
|
for(j=0; j<7; j++)
|
|
d[j]= d[j+1];
|
|
d[7]= get_byte(pb);
|
|
|
|
size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
|
|
|
|
if( d[2] >= '0' && d[2] <= '9'
|
|
&& d[3] >= '0' && d[3] <= '9'){
|
|
n= (d[2] - '0') * 10 + (d[3] - '0');
|
|
}else{
|
|
n= 100; //invalid stream id
|
|
}
|
|
//av_log(NULL, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %"PRId64" %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
|
|
if(i + size > avi->fsize || d[0]<0)
|
|
continue;
|
|
|
|
//parse ix##
|
|
if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
|
|
//parse JUNK
|
|
||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
|
|
||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
|
|
url_fskip(pb, size);
|
|
//av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
|
|
goto resync;
|
|
}
|
|
|
|
if( d[0] >= '0' && d[0] <= '9'
|
|
&& d[1] >= '0' && d[1] <= '9'){
|
|
n= (d[0] - '0') * 10 + (d[1] - '0');
|
|
}else{
|
|
n= 100; //invalid stream id
|
|
}
|
|
|
|
//parse ##dc/##wb
|
|
if(n < s->nb_streams){
|
|
AVStream *st;
|
|
AVIStream *ast;
|
|
st = s->streams[n];
|
|
ast = st->priv_data;
|
|
|
|
if( (st->discard >= AVDISCARD_DEFAULT && size==0)
|
|
/*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
|
|
|| st->discard >= AVDISCARD_ALL){
|
|
if(ast->sample_size) ast->frame_offset += pkt->size;
|
|
else ast->frame_offset++;
|
|
url_fskip(pb, size);
|
|
goto resync;
|
|
}
|
|
|
|
if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
|
|
d[2]*256+d[3] == ast->prefix /*||
|
|
(d[2] == 'd' && d[3] == 'c') ||
|
|
(d[2] == 'w' && d[3] == 'b')*/) {
|
|
|
|
//av_log(NULL, AV_LOG_DEBUG, "OK\n");
|
|
if(d[2]*256+d[3] == ast->prefix)
|
|
ast->prefix_count++;
|
|
else{
|
|
ast->prefix= d[2]*256+d[3];
|
|
ast->prefix_count= 0;
|
|
}
|
|
|
|
avi->stream_index= n;
|
|
ast->packet_size= size + 8;
|
|
ast->remaining= size;
|
|
|
|
{
|
|
uint64_t pos= url_ftell(pb) - 8;
|
|
if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
|
|
av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME);
|
|
}
|
|
}
|
|
goto resync;
|
|
}
|
|
}
|
|
/* palette changed chunk */
|
|
if ( d[0] >= '0' && d[0] <= '9'
|
|
&& d[1] >= '0' && d[1] <= '9'
|
|
&& ((d[2] == 'p' && d[3] == 'c'))
|
|
&& n < s->nb_streams && i + size <= avi->fsize) {
|
|
|
|
AVStream *st;
|
|
int first, clr, flags, k, p;
|
|
|
|
st = s->streams[n];
|
|
|
|
first = get_byte(pb);
|
|
clr = get_byte(pb);
|
|
if(!clr) /* all 256 colors used */
|
|
clr = 256;
|
|
flags = get_le16(pb);
|
|
p = 4;
|
|
for (k = first; k < clr + first; k++) {
|
|
int r, g, b;
|
|
r = get_byte(pb);
|
|
g = get_byte(pb);
|
|
b = get_byte(pb);
|
|
get_byte(pb);
|
|
st->codec->palctrl->palette[k] = b + (g << 8) + (r << 16);
|
|
}
|
|
st->codec->palctrl->palette_changed = 1;
|
|
goto resync;
|
|
}
|
|
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
/* XXX: we make the implicit supposition that the position are sorted
|
|
for each stream */
|
|
static int avi_read_idx1(AVFormatContext *s, int size)
|
|
{
|
|
AVIContext *avi = s->priv_data;
|
|
ByteIOContext *pb = &s->pb;
|
|
int nb_index_entries, i;
|
|
AVStream *st;
|
|
AVIStream *ast;
|
|
unsigned int index, tag, flags, pos, len;
|
|
unsigned last_pos= -1;
|
|
|
|
nb_index_entries = size / 16;
|
|
if (nb_index_entries <= 0)
|
|
return -1;
|
|
|
|
/* read the entries and sort them in each stream component */
|
|
for(i = 0; i < nb_index_entries; i++) {
|
|
tag = get_le32(pb);
|
|
flags = get_le32(pb);
|
|
pos = get_le32(pb);
|
|
len = get_le32(pb);
|
|
#if defined(DEBUG_SEEK)
|
|
av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
|
|
i, tag, flags, pos, len);
|
|
#endif
|
|
if(i==0 && pos > avi->movi_list)
|
|
avi->movi_list= 0; //FIXME better check
|
|
pos += avi->movi_list;
|
|
|
|
index = ((tag & 0xff) - '0') * 10;
|
|
index += ((tag >> 8) & 0xff) - '0';
|
|
if (index >= s->nb_streams)
|
|
continue;
|
|
st = s->streams[index];
|
|
ast = st->priv_data;
|
|
|
|
#if defined(DEBUG_SEEK)
|
|
av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
|
|
#endif
|
|
if(last_pos == pos)
|
|
avi->non_interleaved= 1;
|
|
else
|
|
av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
|
|
if(ast->sample_size)
|
|
ast->cum_len += len;
|
|
else
|
|
ast->cum_len ++;
|
|
last_pos= pos;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int guess_ni_flag(AVFormatContext *s){
|
|
int i;
|
|
int64_t last_start=0;
|
|
int64_t first_end= INT64_MAX;
|
|
|
|
for(i=0; i<s->nb_streams; i++){
|
|
AVStream *st = s->streams[i];
|
|
int n= st->nb_index_entries;
|
|
|
|
if(n <= 0)
|
|
continue;
|
|
|
|
if(st->index_entries[0].pos > last_start)
|
|
last_start= st->index_entries[0].pos;
|
|
if(st->index_entries[n-1].pos < first_end)
|
|
first_end= st->index_entries[n-1].pos;
|
|
}
|
|
return last_start > first_end;
|
|
}
|
|
|
|
static int avi_load_index(AVFormatContext *s)
|
|
{
|
|
AVIContext *avi = s->priv_data;
|
|
ByteIOContext *pb = &s->pb;
|
|
uint32_t tag, size;
|
|
offset_t pos= url_ftell(pb);
|
|
|
|
url_fseek(pb, avi->movi_end, SEEK_SET);
|
|
#ifdef DEBUG_SEEK
|
|
printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
|
|
#endif
|
|
for(;;) {
|
|
if (url_feof(pb))
|
|
break;
|
|
tag = get_le32(pb);
|
|
size = get_le32(pb);
|
|
#ifdef DEBUG_SEEK
|
|
printf("tag=%c%c%c%c size=0x%x\n",
|
|
tag & 0xff,
|
|
(tag >> 8) & 0xff,
|
|
(tag >> 16) & 0xff,
|
|
(tag >> 24) & 0xff,
|
|
size);
|
|
#endif
|
|
switch(tag) {
|
|
case MKTAG('i', 'd', 'x', '1'):
|
|
if (avi_read_idx1(s, size) < 0)
|
|
goto skip;
|
|
else
|
|
goto the_end;
|
|
break;
|
|
default:
|
|
skip:
|
|
size += (size & 1);
|
|
url_fskip(pb, size);
|
|
break;
|
|
}
|
|
}
|
|
the_end:
|
|
url_fseek(pb, pos, SEEK_SET);
|
|
return 0;
|
|
}
|
|
|
|
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
|
|
{
|
|
AVIContext *avi = s->priv_data;
|
|
AVStream *st;
|
|
int i, index;
|
|
int64_t pos;
|
|
|
|
if (!avi->index_loaded) {
|
|
/* we only load the index on demand */
|
|
avi_load_index(s);
|
|
avi->index_loaded = 1;
|
|
}
|
|
assert(stream_index>= 0);
|
|
|
|
st = s->streams[stream_index];
|
|
index= av_index_search_timestamp(st, timestamp, flags);
|
|
if(index<0)
|
|
return -1;
|
|
|
|
/* find the position */
|
|
pos = st->index_entries[index].pos;
|
|
timestamp = st->index_entries[index].timestamp;
|
|
|
|
// av_log(NULL, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
|
|
|
|
if (ENABLE_DV_DEMUXER && avi->dv_demux) {
|
|
/* One and only one real stream for DV in AVI, and it has video */
|
|
/* offsets. Calling with other stream indices should have failed */
|
|
/* the av_index_search_timestamp call above. */
|
|
assert(stream_index == 0);
|
|
|
|
/* Feed the DV video stream version of the timestamp to the */
|
|
/* DV demux so it can synth correct timestamps */
|
|
dv_offset_reset(avi->dv_demux, timestamp);
|
|
|
|
url_fseek(&s->pb, pos, SEEK_SET);
|
|
avi->stream_index= -1;
|
|
return 0;
|
|
}
|
|
|
|
for(i = 0; i < s->nb_streams; i++) {
|
|
AVStream *st2 = s->streams[i];
|
|
AVIStream *ast2 = st2->priv_data;
|
|
|
|
ast2->packet_size=
|
|
ast2->remaining= 0;
|
|
|
|
if (st2->nb_index_entries <= 0)
|
|
continue;
|
|
|
|
// assert(st2->codec->block_align);
|
|
assert(st2->time_base.den == ast2->rate);
|
|
assert(st2->time_base.num == ast2->scale);
|
|
index = av_index_search_timestamp(
|
|
st2,
|
|
av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
|
|
flags | AVSEEK_FLAG_BACKWARD);
|
|
if(index<0)
|
|
index=0;
|
|
|
|
if(!avi->non_interleaved){
|
|
while(index>0 && st2->index_entries[index].pos > pos)
|
|
index--;
|
|
while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
|
|
index++;
|
|
}
|
|
|
|
// av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
|
|
/* extract the current frame number */
|
|
ast2->frame_offset = st2->index_entries[index].timestamp;
|
|
if(ast2->sample_size)
|
|
ast2->frame_offset *=ast2->sample_size;
|
|
}
|
|
|
|
/* do the seek */
|
|
url_fseek(&s->pb, pos, SEEK_SET);
|
|
avi->stream_index= -1;
|
|
return 0;
|
|
}
|
|
|
|
static int avi_read_close(AVFormatContext *s)
|
|
{
|
|
int i;
|
|
AVIContext *avi = s->priv_data;
|
|
|
|
for(i=0;i<s->nb_streams;i++) {
|
|
AVStream *st = s->streams[i];
|
|
AVIStream *ast = st->priv_data;
|
|
av_free(ast);
|
|
av_free(st->codec->palctrl);
|
|
}
|
|
|
|
if (avi->dv_demux)
|
|
av_free(avi->dv_demux);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int avi_probe(AVProbeData *p)
|
|
{
|
|
int i;
|
|
|
|
/* check file header */
|
|
for(i=0; avi_headers[i][0]; i++)
|
|
if(!memcmp(p->buf , avi_headers[i] , 4) &&
|
|
!memcmp(p->buf+8, avi_headers[i]+4, 4))
|
|
return AVPROBE_SCORE_MAX;
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat avi_demuxer = {
|
|
"avi",
|
|
"avi format",
|
|
sizeof(AVIContext),
|
|
avi_probe,
|
|
avi_read_header,
|
|
avi_read_packet,
|
|
avi_read_close,
|
|
avi_read_seek,
|
|
};
|