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ffmpeg/libavformat/rpl.c

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/*
* ARMovie/RPL demuxer
* Copyright (c) 2007 Christian Ohm, 2008 Eli Friedman
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <inttypes.h>
#include <stdlib.h>
#include "libavutil/avstring.h"
#include "libavutil/dict.h"
#include "avformat.h"
#include "internal.h"
#define RPL_SIGNATURE "ARMovie\x0A"
#define RPL_SIGNATURE_SIZE 8
/** 256 is arbitrary, but should be big enough for any reasonable file. */
#define RPL_LINE_LENGTH 256
static int rpl_probe(const AVProbeData *p)
{
if (memcmp(p->buf, RPL_SIGNATURE, RPL_SIGNATURE_SIZE))
return 0;
return AVPROBE_SCORE_MAX;
}
typedef struct RPLContext {
// RPL header data
int32_t frames_per_chunk;
// Stream position data
uint32_t chunk_number;
uint32_t chunk_part;
uint32_t frame_in_part;
} RPLContext;
static int read_line(AVIOContext * pb, char* line, int bufsize)
{
int i;
for (i = 0; i < bufsize - 1; i++) {
int b = avio_r8(pb);
if (b == 0)
break;
if (b == '\n') {
line[i] = '\0';
return avio_feof(pb) ? -1 : 0;
}
line[i] = b;
}
line[i] = '\0';
return -1;
}
static int32_t read_int(const char* line, const char** endptr, int* error)
{
unsigned long result = 0;
for (; *line>='0' && *line<='9'; line++) {
if (result > (0x7FFFFFFF - 9) / 10)
*error = -1;
result = 10 * result + *line - '0';
}
*endptr = line;
return result;
}
static int32_t read_line_and_int(AVIOContext * pb, int* error)
{
char line[RPL_LINE_LENGTH];
const char *endptr;
*error |= read_line(pb, line, sizeof(line));
return read_int(line, &endptr, error);
}
/** Parsing for fps, which can be a fraction. Unfortunately,
* the spec for the header leaves out a lot of details,
* so this is mostly guessing.
*/
static AVRational read_fps(const char* line, int* error)
{
int64_t num, den = 1;
AVRational result;
num = read_int(line, &line, error);
if (*line == '.')
line++;
for (; *line>='0' && *line<='9'; line++) {
// Truncate any numerator too large to fit into an int64_t
if (num > (INT64_MAX - 9) / 10 || den > INT64_MAX / 10)
break;
num = 10 * num + *line - '0';
den *= 10;
}
if (!num)
*error = -1;
av_reduce(&result.num, &result.den, num, den, 0x7FFFFFFF);
return result;
}
static int rpl_read_header(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
RPLContext *rpl = s->priv_data;
AVStream *vst = NULL, *ast = NULL;
int total_audio_size;
int error = 0;
const char *endptr;
char audio_type[RPL_LINE_LENGTH];
uint32_t i;
int32_t video_format, audio_format, chunk_catalog_offset, number_of_chunks;
AVRational fps;
char line[RPL_LINE_LENGTH];
// The header for RPL/ARMovie files is 21 lines of text
// containing the various header fields. The fields are always
// in the same order, and other text besides the first
// number usually isn't important.
// (The spec says that there exists some significance
// for the text in a few cases; samples needed.)
error |= read_line(pb, line, sizeof(line)); // ARMovie
error |= read_line(pb, line, sizeof(line)); // movie name
av_dict_set(&s->metadata, "title" , line, 0);
error |= read_line(pb, line, sizeof(line)); // date/copyright
av_dict_set(&s->metadata, "copyright", line, 0);
error |= read_line(pb, line, sizeof(line)); // author and other
av_dict_set(&s->metadata, "author" , line, 0);
// video headers
video_format = read_line_and_int(pb, &error);
if (video_format) {
vst = avformat_new_stream(s, NULL);
if (!vst)
return AVERROR(ENOMEM);
vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
vst->codecpar->codec_tag = video_format;
vst->codecpar->width = read_line_and_int(pb, &error); // video width
vst->codecpar->height = read_line_and_int(pb, &error); // video height
vst->codecpar->bits_per_coded_sample = read_line_and_int(pb, &error); // video bits per sample
// Figure out the video codec
switch (vst->codecpar->codec_tag) {
#if 0
case 122:
vst->codecpar->codec_id = AV_CODEC_ID_ESCAPE122;
break;
#endif
case 124:
vst->codecpar->codec_id = AV_CODEC_ID_ESCAPE124;
// The header is wrong here, at least sometimes
vst->codecpar->bits_per_coded_sample = 16;
break;
case 130:
vst->codecpar->codec_id = AV_CODEC_ID_ESCAPE130;
break;
default:
avpriv_report_missing_feature(s, "Video format %s",
av_fourcc2str(vst->codecpar->codec_tag));
vst->codecpar->codec_id = AV_CODEC_ID_NONE;
}
} else {
for (i = 0; i < 3; i++)
error |= read_line(pb, line, sizeof(line));
}
error |= read_line(pb, line, sizeof(line)); // video frames per second
fps = read_fps(line, &error);
if (vst)
avpriv_set_pts_info(vst, 32, fps.den, fps.num);
// Audio headers
// ARMovie supports multiple audio tracks; I don't have any
// samples, though. This code will ignore additional tracks.
audio_format = read_line_and_int(pb, &error); // audio format ID
if (audio_format) {
ast = avformat_new_stream(s, NULL);
if (!ast)
return AVERROR(ENOMEM);
ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
ast->codecpar->codec_tag = audio_format;
ast->codecpar->sample_rate = read_line_and_int(pb, &error); // audio bitrate
ast->codecpar->channels = read_line_and_int(pb, &error); // number of audio channels
error |= read_line(pb, line, sizeof(line));
ast->codecpar->bits_per_coded_sample = read_int(line, &endptr, &error); // audio bits per sample
av_strlcpy(audio_type, endptr, RPL_LINE_LENGTH);
// At least one sample uses 0 for ADPCM, which is really 4 bits
// per sample.
if (ast->codecpar->bits_per_coded_sample == 0)
ast->codecpar->bits_per_coded_sample = 4;
ast->codecpar->bit_rate = ast->codecpar->sample_rate *
ast->codecpar->bits_per_coded_sample *
ast->codecpar->channels;
ast->codecpar->codec_id = AV_CODEC_ID_NONE;
switch (audio_format) {
case 1:
if (ast->codecpar->bits_per_coded_sample == 16) {
// 16-bit audio is always signed
ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
break;
} else if (ast->codecpar->bits_per_coded_sample == 8) {
if(av_stristr(audio_type, "unsigned") != NULL) {
ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
break;
} else if(av_stristr(audio_type, "linear") != NULL) {
ast->codecpar->codec_id = AV_CODEC_ID_PCM_S8;
break;
} else {
ast->codecpar->codec_id = AV_CODEC_ID_PCM_VIDC;
break;
}
}
// There are some other formats listed as legal per the spec;
// samples needed.
break;
case 101:
if (ast->codecpar->bits_per_coded_sample == 8) {
// The samples with this kind of audio that I have
// are all unsigned.
ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
break;
} else if (ast->codecpar->bits_per_coded_sample == 4) {
ast->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_EA_SEAD;
break;
}
break;
}
if (ast->codecpar->codec_id == AV_CODEC_ID_NONE)
avpriv_request_sample(s, "Audio format %"PRId32,
audio_format);
avpriv_set_pts_info(ast, 32, 1, ast->codecpar->bit_rate);
} else {
for (i = 0; i < 3; i++)
error |= read_line(pb, line, sizeof(line));
}
if (s->nb_streams == 0)
return AVERROR_INVALIDDATA;
rpl->frames_per_chunk = read_line_and_int(pb, &error); // video frames per chunk
if (vst && rpl->frames_per_chunk > 1 && vst->codecpar->codec_tag != 124)
av_log(s, AV_LOG_WARNING,
"Don't know how to split frames for video format %s. "
"Video stream will be broken!\n", av_fourcc2str(vst->codecpar->codec_tag));
number_of_chunks = read_line_and_int(pb, &error); // number of chunks in the file
// The number in the header is actually the index of the last chunk.
number_of_chunks++;
error |= read_line(pb, line, sizeof(line)); // "even" chunk size in bytes
error |= read_line(pb, line, sizeof(line)); // "odd" chunk size in bytes
chunk_catalog_offset = // offset of the "chunk catalog"
read_line_and_int(pb, &error); // (file index)
error |= read_line(pb, line, sizeof(line)); // offset to "helpful" sprite
error |= read_line(pb, line, sizeof(line)); // size of "helpful" sprite
if (vst) {
error |= read_line(pb, line, sizeof(line)); // offset to key frame list
vst->duration = number_of_chunks * rpl->frames_per_chunk;
}
// Read the index
avio_seek(pb, chunk_catalog_offset, SEEK_SET);
total_audio_size = 0;
for (i = 0; !error && i < number_of_chunks; i++) {
int64_t offset, video_size, audio_size;
error |= read_line(pb, line, sizeof(line));
if (3 != sscanf(line, "%"SCNd64" , %"SCNd64" ; %"SCNd64,
&offset, &video_size, &audio_size)) {
error = -1;
continue;
}
if (vst)
av_add_index_entry(vst, offset, i * rpl->frames_per_chunk,
video_size, rpl->frames_per_chunk, 0);
if (ast)
av_add_index_entry(ast, offset + video_size, total_audio_size,
audio_size, audio_size * 8, 0);
total_audio_size += audio_size * 8;
}
if (error) return AVERROR(EIO);
return 0;
}
static int rpl_read_packet(AVFormatContext *s, AVPacket *pkt)
{
RPLContext *rpl = s->priv_data;
AVIOContext *pb = s->pb;
AVStream* stream;
AVIndexEntry* index_entry;
int ret;
if (rpl->chunk_part == s->nb_streams) {
rpl->chunk_number++;
rpl->chunk_part = 0;
}
stream = s->streams[rpl->chunk_part];
if (rpl->chunk_number >= stream->internal->nb_index_entries)
return AVERROR_EOF;
index_entry = &stream->internal->index_entries[rpl->chunk_number];
if (rpl->frame_in_part == 0)
if (avio_seek(pb, index_entry->pos, SEEK_SET) < 0)
return AVERROR(EIO);
if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
stream->codecpar->codec_tag == 124) {
// We have to split Escape 124 frames because there are
// multiple frames per chunk in Escape 124 samples.
uint32_t frame_size;
avio_skip(pb, 4); /* flags */
frame_size = avio_rl32(pb);
if (avio_seek(pb, -8, SEEK_CUR) < 0)
return AVERROR(EIO);
ret = av_get_packet(pb, pkt, frame_size);
if (ret < 0)
return ret;
if (ret != frame_size) {
return AVERROR(EIO);
}
pkt->duration = 1;
pkt->pts = index_entry->timestamp + rpl->frame_in_part;
pkt->stream_index = rpl->chunk_part;
rpl->frame_in_part++;
if (rpl->frame_in_part == rpl->frames_per_chunk) {
rpl->frame_in_part = 0;
rpl->chunk_part++;
}
} else {
ret = av_get_packet(pb, pkt, index_entry->size);
if (ret < 0)
return ret;
if (ret != index_entry->size) {
return AVERROR(EIO);
}
if (stream->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
// frames_per_chunk should always be one here; the header
// parsing will warn if it isn't.
pkt->duration = rpl->frames_per_chunk;
} else {
// All the audio codecs supported in this container
// (at least so far) are constant-bitrate.
pkt->duration = ret * 8;
}
pkt->pts = index_entry->timestamp;
pkt->stream_index = rpl->chunk_part;
rpl->chunk_part++;
}
// None of the Escape formats have keyframes, and the ADPCM
// format used doesn't have keyframes.
if (rpl->chunk_number == 0 && rpl->frame_in_part == 0)
pkt->flags |= AV_PKT_FLAG_KEY;
return ret;
}
AVInputFormat ff_rpl_demuxer = {
.name = "rpl",
.long_name = NULL_IF_CONFIG_SMALL("RPL / ARMovie"),
.priv_data_size = sizeof(RPLContext),
.read_probe = rpl_probe,
.read_header = rpl_read_header,
.read_packet = rpl_read_packet,
};
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