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790f793844
There are lots of files that don't need it: The number of object files that actually need it went down from 2011 to 884 here. Keep it for external users in order to not cause breakages. Also improve the other headers a bit while just at it. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
237 lines
7.2 KiB
C
237 lines
7.2 KiB
C
/*
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* mtv demuxer
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* Copyright (c) 2006 Reynaldo H. Verdejo Pinochet
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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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/**
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* @file
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* MTV demuxer.
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*/
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#include "libavutil/intreadwrite.h"
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#include "libavutil/mem.h"
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#include "avformat.h"
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#include "demux.h"
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#include "internal.h"
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#define MTV_ASUBCHUNK_DATA_SIZE 500
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#define MTV_HEADER_SIZE 512
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#define MTV_AUDIO_PADDING_SIZE 12
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#define MTV_IMAGE_DEFAULT_BPP 16
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#define MTV_AUDIO_SAMPLING_RATE 44100
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typedef struct MTVDemuxContext {
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unsigned int file_size; ///< filesize, not always right
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unsigned int segments; ///< number of 512 byte segments
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unsigned int audio_identifier; ///< 'MP3' on all files I have seen
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unsigned int audio_br; ///< bitrate of audio channel (mp3)
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unsigned int img_colorfmt; ///< frame colorfmt rgb 565/555
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unsigned int img_bpp; ///< frame bits per pixel
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unsigned int img_width;
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unsigned int img_height;
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unsigned int img_segment_size; ///< size of image segment
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unsigned int video_fps;
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unsigned int full_segment_size;
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} MTVDemuxContext;
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static int mtv_probe(const AVProbeData *p)
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{
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/* we need at least 57 bytes from the header
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* to try parsing all required fields
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*/
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if (p->buf_size < 57)
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return 0;
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/* Magic is 'AMV' */
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if (*p->buf != 'A' || *(p->buf + 1) != 'M' || *(p->buf + 2) != 'V')
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return 0;
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/* Audio magic is always MP3 */
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if (p->buf[43] != 'M' || p->buf[44] != 'P' || p->buf[45] != '3')
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return 0;
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/* Check for nonzero in bpp and (width|height) header fields */
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if(!(p->buf[51] && AV_RL16(&p->buf[52]) | AV_RL16(&p->buf[54])))
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return 0;
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/* If width or height are 0 then imagesize header field should not */
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if(!AV_RL16(&p->buf[52]) || !AV_RL16(&p->buf[54]))
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{
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if(!!AV_RL16(&p->buf[56]))
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return AVPROBE_SCORE_EXTENSION;
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else
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return 0;
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}
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/* Image bpp is not an absolutely required
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* field as we latter claim it should be 16
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* no matter what. All samples in the wild
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* are RGB565/555.
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*/
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if(p->buf[51] != MTV_IMAGE_DEFAULT_BPP)
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return AVPROBE_SCORE_EXTENSION / 2;
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/* We had enough data to parse header values
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* but we expect to be able to get 512 bytes
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* of header to be sure.
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*/
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if (p->buf_size < MTV_HEADER_SIZE)
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return AVPROBE_SCORE_EXTENSION;
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return AVPROBE_SCORE_MAX;
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}
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static int mtv_read_header(AVFormatContext *s)
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{
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MTVDemuxContext *mtv = s->priv_data;
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AVIOContext *pb = s->pb;
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AVStream *st;
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unsigned int audio_subsegments;
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avio_skip(pb, 3);
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mtv->file_size = avio_rl32(pb);
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mtv->segments = avio_rl32(pb);
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avio_skip(pb, 32);
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mtv->audio_identifier = avio_rl24(pb);
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mtv->audio_br = avio_rl16(pb);
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mtv->img_colorfmt = avio_rl24(pb);
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mtv->img_bpp = avio_r8(pb);
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mtv->img_width = avio_rl16(pb);
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mtv->img_height = avio_rl16(pb);
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mtv->img_segment_size = avio_rl16(pb);
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/* Assume 16bpp even if claimed otherwise.
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* We know its going to be RGBG565/555 anyway
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*/
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if (mtv->img_bpp != MTV_IMAGE_DEFAULT_BPP) {
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av_log (s, AV_LOG_WARNING, "Header claims %dbpp (!= 16). Ignoring\n",
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mtv->img_bpp);
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mtv->img_bpp = MTV_IMAGE_DEFAULT_BPP;
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}
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/* Calculate width and height if missing from header */
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if (!mtv->img_width && mtv->img_height > 0 && mtv->img_bpp >= 8)
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mtv->img_width=mtv->img_segment_size / (mtv->img_bpp>>3)
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/ mtv->img_height;
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if (!mtv->img_height && mtv->img_width > 0 && mtv->img_bpp >= 8)
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mtv->img_height=mtv->img_segment_size / (mtv->img_bpp>>3)
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/ mtv->img_width;
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if(!mtv->img_height || !mtv->img_width || !mtv->img_segment_size){
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av_log(s, AV_LOG_ERROR, "width or height or segment_size is invalid and I cannot calculate them from other information\n");
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return AVERROR_INVALIDDATA;
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}
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avio_skip(pb, 4);
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audio_subsegments = avio_rl16(pb);
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if (audio_subsegments == 0) {
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avpriv_request_sample(s, "MTV files without audio");
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return AVERROR_PATCHWELCOME;
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}
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mtv->full_segment_size =
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audio_subsegments * (MTV_AUDIO_PADDING_SIZE + MTV_ASUBCHUNK_DATA_SIZE) +
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mtv->img_segment_size;
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mtv->video_fps = (mtv->audio_br / 4) / audio_subsegments;
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// FIXME Add sanity check here
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// all systems go! init decoders
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// video - raw rgb565
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st = avformat_new_stream(s, NULL);
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if(!st)
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return AVERROR(ENOMEM);
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avpriv_set_pts_info(st, 64, 1, mtv->video_fps);
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
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st->codecpar->format = AV_PIX_FMT_RGB565BE;
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st->codecpar->width = mtv->img_width;
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st->codecpar->height = mtv->img_height;
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st->codecpar->extradata = av_strdup("BottomUp");
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if (!st->codecpar->extradata)
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return AVERROR(ENOMEM);
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st->codecpar->extradata_size = 9;
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// audio - mp3
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st = avformat_new_stream(s, NULL);
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if(!st)
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return AVERROR(ENOMEM);
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avpriv_set_pts_info(st, 64, 1, MTV_AUDIO_SAMPLING_RATE);
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = AV_CODEC_ID_MP3;
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st->codecpar->bit_rate = mtv->audio_br;
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ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL;
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// Jump over header
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if(avio_seek(pb, MTV_HEADER_SIZE, SEEK_SET) != MTV_HEADER_SIZE)
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return AVERROR(EIO);
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return 0;
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}
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static int mtv_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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MTVDemuxContext *mtv = s->priv_data;
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AVIOContext *pb = s->pb;
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int ret;
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if((avio_tell(pb) - ffformatcontext(s)->data_offset + mtv->img_segment_size) % mtv->full_segment_size)
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{
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avio_skip(pb, MTV_AUDIO_PADDING_SIZE);
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ret = av_get_packet(pb, pkt, MTV_ASUBCHUNK_DATA_SIZE);
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if(ret < 0)
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return ret;
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pkt->pos -= MTV_AUDIO_PADDING_SIZE;
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pkt->stream_index = 1;
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}else
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{
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ret = av_get_packet(pb, pkt, mtv->img_segment_size);
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if(ret < 0)
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return ret;
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pkt->stream_index = 0;
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}
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return ret;
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}
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const FFInputFormat ff_mtv_demuxer = {
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.p.name = "mtv",
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.p.long_name = NULL_IF_CONFIG_SMALL("MTV"),
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.priv_data_size = sizeof(MTVDemuxContext),
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.read_probe = mtv_probe,
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.read_header = mtv_read_header,
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.read_packet = mtv_read_packet,
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};
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