ffmpeg/libavformat/rpl.c
Stefano Sabatini 72415b2adb Define AVMediaType enum, and use it instead of enum CodecType, which
is deprecated and will be dropped at the next major bump.

Originally committed as revision 22735 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-03-30 23:30:55 +00:00

360 lines
12 KiB
C

/*
* 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 "libavutil/avstring.h"
#include "avformat.h"
#include <stdlib.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(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(ByteIOContext * pb, char* line, int bufsize)
{
int i;
for (i = 0; i < bufsize - 1; i++) {
int b = get_byte(pb);
if (b == 0)
break;
if (b == '\n') {
line[i] = '\0';
return 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(ByteIOContext * 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, AVFormatParameters *ap)
{
ByteIOContext *pb = s->pb;
RPLContext *rpl = s->priv_data;
AVStream *vst = NULL, *ast = NULL;
int total_audio_size;
int error = 0;
uint32_t i;
int32_t 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_metadata_set(&s->metadata, "title" , line);
error |= read_line(pb, line, sizeof(line)); // date/copyright
av_metadata_set(&s->metadata, "copyright", line);
error |= read_line(pb, line, sizeof(line)); // author and other
av_metadata_set(&s->metadata, "author" , line);
// video headers
vst = av_new_stream(s, 0);
if (!vst)
return AVERROR(ENOMEM);
vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
vst->codec->codec_tag = read_line_and_int(pb, &error); // video format
vst->codec->width = read_line_and_int(pb, &error); // video width
vst->codec->height = read_line_and_int(pb, &error); // video height
vst->codec->bits_per_coded_sample = read_line_and_int(pb, &error); // video bits per sample
error |= read_line(pb, line, sizeof(line)); // video frames per second
fps = read_fps(line, &error);
av_set_pts_info(vst, 32, fps.den, fps.num);
// Figure out the video codec
switch (vst->codec->codec_tag) {
#if 0
case 122:
vst->codec->codec_id = CODEC_ID_ESCAPE122;
break;
#endif
case 124:
vst->codec->codec_id = CODEC_ID_ESCAPE124;
// The header is wrong here, at least sometimes
vst->codec->bits_per_coded_sample = 16;
break;
#if 0
case 130:
vst->codec->codec_id = CODEC_ID_ESCAPE130;
break;
#endif
default:
av_log(s, AV_LOG_WARNING,
"RPL video format %i not supported yet!\n",
vst->codec->codec_tag);
vst->codec->codec_id = CODEC_ID_NONE;
}
// 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 = av_new_stream(s, 0);
if (!ast)
return AVERROR(ENOMEM);
ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
ast->codec->codec_tag = audio_format;
ast->codec->sample_rate = read_line_and_int(pb, &error); // audio bitrate
ast->codec->channels = read_line_and_int(pb, &error); // number of audio channels
ast->codec->bits_per_coded_sample = read_line_and_int(pb, &error); // audio bits per sample
// At least one sample uses 0 for ADPCM, which is really 4 bits
// per sample.
if (ast->codec->bits_per_coded_sample == 0)
ast->codec->bits_per_coded_sample = 4;
ast->codec->bit_rate = ast->codec->sample_rate *
ast->codec->bits_per_coded_sample *
ast->codec->channels;
ast->codec->codec_id = CODEC_ID_NONE;
switch (audio_format) {
case 1:
if (ast->codec->bits_per_coded_sample == 16) {
// 16-bit audio is always signed
ast->codec->codec_id = CODEC_ID_PCM_S16LE;
break;
}
// There are some other formats listed as legal per the spec;
// samples needed.
break;
case 101:
if (ast->codec->bits_per_coded_sample == 8) {
// The samples with this kind of audio that I have
// are all unsigned.
ast->codec->codec_id = CODEC_ID_PCM_U8;
break;
} else if (ast->codec->bits_per_coded_sample == 4) {
ast->codec->codec_id = CODEC_ID_ADPCM_IMA_EA_SEAD;
break;
}
break;
}
if (ast->codec->codec_id == CODEC_ID_NONE) {
av_log(s, AV_LOG_WARNING,
"RPL audio format %i not supported yet!\n",
audio_format);
}
av_set_pts_info(ast, 32, 1, ast->codec->bit_rate);
} else {
for (i = 0; i < 3; i++)
error |= read_line(pb, line, sizeof(line));
}
rpl->frames_per_chunk = read_line_and_int(pb, &error); // video frames per chunk
if (rpl->frames_per_chunk > 1 && vst->codec->codec_tag != 124)
av_log(s, AV_LOG_WARNING,
"Don't know how to split frames for video format %i. "
"Video stream will be broken!\n", vst->codec->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
error |= read_line(pb, line, sizeof(line)); // offset to key frame list
// Read the index
url_fseek(pb, chunk_catalog_offset, SEEK_SET);
total_audio_size = 0;
for (i = 0; i < number_of_chunks; i++) {
int64_t offset, video_size, audio_size;
error |= read_line(pb, line, sizeof(line));
if (3 != sscanf(line, "%"PRId64" , %"PRId64" ; %"PRId64,
&offset, &video_size, &audio_size))
error = -1;
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;
ByteIOContext *pb = s->pb;
AVStream* stream;
AVIndexEntry* index_entry;
uint32_t 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->nb_index_entries)
return -1;
index_entry = &stream->index_entries[rpl->chunk_number];
if (rpl->frame_in_part == 0)
if (url_fseek(pb, index_entry->pos, SEEK_SET) < 0)
return AVERROR(EIO);
if (stream->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
stream->codec->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, frame_flags;
frame_flags = get_le32(pb);
frame_size = get_le32(pb);
if (url_fseek(pb, -8, SEEK_CUR) < 0)
return AVERROR(EIO);
ret = av_get_packet(pb, pkt, frame_size);
if (ret != frame_size) {
av_free_packet(pkt);
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 != index_entry->size) {
av_free_packet(pkt);
return AVERROR(EIO);
}
if (stream->codec->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 |= PKT_FLAG_KEY;
return ret;
}
AVInputFormat rpl_demuxer = {
"rpl",
NULL_IF_CONFIG_SMALL("RPL/ARMovie format"),
sizeof(RPLContext),
rpl_probe,
rpl_read_header,
rpl_read_packet,
};