virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-11-26 19:01:44 +02:00
Code Issues Releases Activity
e9b78eeba2
FFmpeg/libavformat/raw.c
Michael Niedermayer e9b78eeba2 better generic index building and seeking code 
Originally committed as revision 7841 to svn://svn.ffmpeg.org/ffmpeg/trunk
2007-02-05 23:04:48 +00:00

858 lines
20 KiB
C
Raw Blame History

/*
* RAW muxer and demuxer
* Copyright (c) 2001 Fabrice Bellard.
* Copyright (c) 2005 Alex Beregszaszi
*
* 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 "avformat.h"
#ifdef CONFIG_MUXERS
/* simple formats */
static int raw_write_header(struct AVFormatContext *s)
{
return 0;
}
static int flac_write_header(struct AVFormatContext *s)
{
static const uint8_t header[8] = {
0x66, 0x4C, 0x61, 0x43, 0x80, 0x00, 0x00, 0x22
};
uint8_t *streaminfo = s->streams[0]->codec->extradata;
int len = s->streams[0]->codec->extradata_size;
if(streaminfo != NULL && len > 0) {
put_buffer(&s->pb, header, 8);
put_buffer(&s->pb, streaminfo, len);
}
return 0;
}
static int raw_write_packet(struct AVFormatContext *s, AVPacket *pkt)
{
put_buffer(&s->pb, pkt->data, pkt->size);
put_flush_packet(&s->pb);
return 0;
}
static int raw_write_trailer(struct AVFormatContext *s)
{
return 0;
}
#endif //CONFIG_MUXERS
/* raw input */
static int raw_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
AVStream *st;
int id;
st = av_new_stream(s, 0);
if (!st)
return AVERROR_NOMEM;
id = s->iformat->value;
if (id == CODEC_ID_RAWVIDEO) {
st->codec->codec_type = CODEC_TYPE_VIDEO;
} else {
st->codec->codec_type = CODEC_TYPE_AUDIO;
}
st->codec->codec_id = id;
switch(st->codec->codec_type) {
case CODEC_TYPE_AUDIO:
st->codec->sample_rate = ap->sample_rate;
st->codec->channels = ap->channels;
av_set_pts_info(st, 64, 1, st->codec->sample_rate);
break;
case CODEC_TYPE_VIDEO:
av_set_pts_info(st, 64, ap->time_base.num, ap->time_base.den);
st->codec->width = ap->width;
st->codec->height = ap->height;
st->codec->pix_fmt = ap->pix_fmt;
if(st->codec->pix_fmt == PIX_FMT_NONE)
st->codec->pix_fmt= PIX_FMT_YUV420P;
break;
default:
return -1;
}
return 0;
}
#define RAW_PACKET_SIZE 1024
static int raw_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int ret, size;
// AVStream *st = s->streams[0];
size= RAW_PACKET_SIZE;
ret= av_get_packet(&s->pb, pkt, size);
pkt->stream_index = 0;
if (ret <= 0) {
return AVERROR_IO;
}
/* note: we need to modify the packet size here to handle the last
packet */
pkt->size = ret;
return ret;
}
static int raw_read_partial_packet(AVFormatContext *s, AVPacket *pkt)
{
int ret, size;
size = RAW_PACKET_SIZE;
if (av_new_packet(pkt, size) < 0)
return AVERROR_IO;
pkt->pos= url_ftell(&s->pb);
pkt->stream_index = 0;
ret = get_partial_buffer(&s->pb, pkt->data, size);
if (ret <= 0) {
av_free_packet(pkt);
return AVERROR_IO;
}
pkt->size = ret;
return ret;
}
// http://www.artificis.hu/files/texts/ingenient.txt
static int ingenient_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int ret, size, w, h, unk1, unk2;
if (get_le32(&s->pb) != MKTAG('M', 'J', 'P', 'G'))
return AVERROR_IO; // FIXME
size = get_le32(&s->pb);
w = get_le16(&s->pb);
h = get_le16(&s->pb);
url_fskip(&s->pb, 8); // zero + size (padded?)
url_fskip(&s->pb, 2);
unk1 = get_le16(&s->pb);
unk2 = get_le16(&s->pb);
url_fskip(&s->pb, 22); // ascii timestamp
av_log(NULL, AV_LOG_DEBUG, "Ingenient packet: size=%d, width=%d, height=%d, unk1=%d unk2=%d\n",
size, w, h, unk1, unk2);
if (av_new_packet(pkt, size) < 0)
return AVERROR_IO;
pkt->pos = url_ftell(&s->pb);
pkt->stream_index = 0;
ret = get_buffer(&s->pb, pkt->data, size);
if (ret <= 0) {
av_free_packet(pkt);
return AVERROR_IO;
}
pkt->size = ret;
return ret;
}
static int raw_read_close(AVFormatContext *s)
{
return 0;
}
int pcm_read_seek(AVFormatContext *s,
int stream_index, int64_t timestamp, int flags)
{
AVStream *st;
int block_align, byte_rate;
int64_t pos;
st = s->streams[0];
block_align = st->codec->block_align ? st->codec->block_align :
(av_get_bits_per_sample(st->codec->codec_id) * st->codec->channels) >> 3;
byte_rate = st->codec->bit_rate ? st->codec->bit_rate >> 3 :
block_align * st->codec->sample_rate;
if (block_align <= 0 || byte_rate <= 0)
return -1;
/* compute the position by aligning it to block_align */
pos = av_rescale_rnd(timestamp * byte_rate,
st->time_base.num,
st->time_base.den * (int64_t)block_align,
(flags & AVSEEK_FLAG_BACKWARD) ? AV_ROUND_DOWN : AV_ROUND_UP);
pos *= block_align;
/* recompute exact position */
st->cur_dts = av_rescale(pos, st->time_base.den, byte_rate * (int64_t)st->time_base.num);
url_fseek(&s->pb, pos + s->data_offset, SEEK_SET);
return 0;
}
/* ac3 read */
static int ac3_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
AVStream *st;
st = av_new_stream(s, 0);
if (!st)
return AVERROR_NOMEM;
st->codec->codec_type = CODEC_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_AC3;
st->need_parsing = 1;
/* the parameters will be extracted from the compressed bitstream */
return 0;
}
static int shorten_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
AVStream *st;
st = av_new_stream(s, 0);
if (!st)
return AVERROR_NOMEM;
st->codec->codec_type = CODEC_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_SHORTEN;
st->need_parsing = 1;
/* the parameters will be extracted from the compressed bitstream */
return 0;
}
/* flac read */
static int flac_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
AVStream *st;
st = av_new_stream(s, 0);
if (!st)
return AVERROR_NOMEM;
st->codec->codec_type = CODEC_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_FLAC;
st->need_parsing = 1;
/* the parameters will be extracted from the compressed bitstream */
return 0;
}
/* dts read */
static int dts_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
AVStream *st;
st = av_new_stream(s, 0);
if (!st)
return AVERROR_NOMEM;
st->codec->codec_type = CODEC_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_DTS;
st->need_parsing = 1;
/* the parameters will be extracted from the compressed bitstream */
return 0;
}
/* aac read */
static int aac_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
AVStream *st;
st = av_new_stream(s, 0);
if (!st)
return AVERROR_NOMEM;
st->codec->codec_type = CODEC_TYPE_AUDIO;
st->codec->codec_id = CODEC_ID_AAC;
st->need_parsing = 1;
/* the parameters will be extracted from the compressed bitstream */
return 0;
}
/* mpeg1/h263 input */
static int video_read_header(AVFormatContext *s,
AVFormatParameters *ap)
{
AVStream *st;
st = av_new_stream(s, 0);
if (!st)
return AVERROR_NOMEM;
st->codec->codec_type = CODEC_TYPE_VIDEO;
st->codec->codec_id = s->iformat->value;
st->need_parsing = 1;
/* for mjpeg, specify frame rate */
/* for mpeg4 specify it too (most mpeg4 streams dont have the fixed_vop_rate set ...)*/
if (ap->time_base.num) {
av_set_pts_info(st, 64, ap->time_base.num, ap->time_base.den);
} else if ( st->codec->codec_id == CODEC_ID_MJPEG ||
st->codec->codec_id == CODEC_ID_MPEG4 ||
st->codec->codec_id == CODEC_ID_H264) {
av_set_pts_info(st, 64, 1, 25);
}
return 0;
}
#define SEQ_START_CODE 0x000001b3
#define GOP_START_CODE 0x000001b8
#define PICTURE_START_CODE 0x00000100
#define SLICE_START_CODE 0x00000101
#define PACK_START_CODE 0x000001ba
#define VIDEO_ID 0x000001e0
#define AUDIO_ID 0x000001c0
static int mpegvideo_probe(AVProbeData *p)
{
uint32_t code= -1;
int pic=0, seq=0, slice=0, pspack=0, pes=0;
int i;
for(i=0; i<p->buf_size; i++){
code = (code<<8) + p->buf[i];
if ((code & 0xffffff00) == 0x100) {
switch(code){
case SEQ_START_CODE: seq++; break;
case PICTURE_START_CODE: pic++; break;
case SLICE_START_CODE: slice++; break;
case PACK_START_CODE: pspack++; break;
case VIDEO_ID:
case AUDIO_ID: pes++; break;
}
}
}
if(seq && seq*9<=pic*10 && pic*9<=slice*10 && !pspack && !pes)
return AVPROBE_SCORE_MAX/2+1; // +1 for .mpg
return 0;
}
#define VIDEO_OBJECT_START_CODE 0x00000100
#define VIDEO_OBJECT_LAYER_START_CODE 0x00000120
#define VISUAL_OBJECT_START_CODE 0x000001b5
#define VOP_START_CODE 0x000001b6
static int mpeg4video_probe(AVProbeData *probe_packet)
{
uint32_t temp_buffer= -1;
int VO=0, VOL=0, VOP = 0, VISO = 0;
int i;
for(i=0; i<probe_packet->buf_size; i++){
temp_buffer = (temp_buffer<<8) + probe_packet->buf[i];
if ((temp_buffer & 0xffffff00) == 0x100) {
switch(temp_buffer){
case VOP_START_CODE: VOP++; break;
case VISUAL_OBJECT_START_CODE: VISO++; break;
}
switch(temp_buffer & 0xfffffff0){
case VIDEO_OBJECT_START_CODE: VO++; break;
case VIDEO_OBJECT_LAYER_START_CODE: VOL++; break;
}
}
}
if ( VOP >= VISO && VOP >= VOL && VO >= VOL && VOL > 0)
return AVPROBE_SCORE_MAX/2;
return 0;
}
static int h263_probe(AVProbeData *p)
{
int code;
const uint8_t *d;
if (p->buf_size < 6)
return 0;
d = p->buf;
code = (d[0] << 14) | (d[1] << 6) | (d[2] >> 2);
if (code == 0x20) {
return 50;
}
return 0;
}
static int h261_probe(AVProbeData *p)
{
int code;
const uint8_t *d;
if (p->buf_size < 6)
return 0;
d = p->buf;
code = (d[0] << 12) | (d[1] << 4) | (d[2] >> 4);
if (code == 0x10) {
return 50;
}
return 0;
}
AVInputFormat shorten_demuxer = {
"shn",
"raw shorten",
0,
NULL,
shorten_read_header,
raw_read_partial_packet,
raw_read_close,
.flags= AVFMT_GENERIC_INDEX,
.extensions = "shn",
};
AVInputFormat flac_demuxer = {
"flac",
"raw flac",
0,
NULL,
flac_read_header,
raw_read_partial_packet,
raw_read_close,
.flags= AVFMT_GENERIC_INDEX,
.extensions = "flac",
};
#ifdef CONFIG_MUXERS
AVOutputFormat flac_muxer = {
"flac",
"raw flac",
"audio/x-flac",
"flac",
0,
CODEC_ID_FLAC,
0,
flac_write_header,
raw_write_packet,
raw_write_trailer,
.flags= AVFMT_NOTIMESTAMPS,
};
#endif //CONFIG_MUXERS
AVInputFormat ac3_demuxer = {
"ac3",
"raw ac3",
0,
NULL,
ac3_read_header,
raw_read_partial_packet,
raw_read_close,
.flags= AVFMT_GENERIC_INDEX,
.extensions = "ac3",
};
#ifdef CONFIG_MUXERS
AVOutputFormat ac3_muxer = {
"ac3",
"raw ac3",
"audio/x-ac3",
"ac3",
0,
CODEC_ID_AC3,
0,
raw_write_header,
raw_write_packet,
raw_write_trailer,
.flags= AVFMT_NOTIMESTAMPS,
};
#endif //CONFIG_MUXERS
AVInputFormat dts_demuxer = {
"dts",
"raw dts",
0,
NULL,
dts_read_header,
raw_read_partial_packet,
raw_read_close,
.flags= AVFMT_GENERIC_INDEX,
.extensions = "dts",
};
AVInputFormat aac_demuxer = {
"aac",
"ADTS AAC",
0,
NULL,
aac_read_header,
raw_read_partial_packet,
raw_read_close,
.flags= AVFMT_GENERIC_INDEX,
.extensions = "aac",
};
AVInputFormat h261_demuxer = {
"h261",
"raw h261",
0,
h261_probe,
video_read_header,
raw_read_partial_packet,
raw_read_close,
.flags= AVFMT_GENERIC_INDEX,
.extensions = "h261",
.value = CODEC_ID_H261,
};
#ifdef CONFIG_MUXERS
AVOutputFormat h261_muxer = {
"h261",
"raw h261",
"video/x-h261",
"h261",
0,
0,
CODEC_ID_H261,
raw_write_header,
raw_write_packet,
raw_write_trailer,
.flags= AVFMT_NOTIMESTAMPS,
};
#endif //CONFIG_MUXERS
AVInputFormat h263_demuxer = {
"h263",
"raw h263",
0,
h263_probe,
video_read_header,
raw_read_partial_packet,
raw_read_close,
.flags= AVFMT_GENERIC_INDEX,
// .extensions = "h263", //FIXME remove after writing mpeg4_probe
.value = CODEC_ID_H263,
};
#ifdef CONFIG_MUXERS
AVOutputFormat h263_muxer = {
"h263",
"raw h263",
"video/x-h263",
"h263",
0,
0,
CODEC_ID_H263,
raw_write_header,
raw_write_packet,
raw_write_trailer,
.flags= AVFMT_NOTIMESTAMPS,
};
#endif //CONFIG_MUXERS
AVInputFormat m4v_demuxer = {
"m4v",
"raw MPEG4 video format",
0,
mpeg4video_probe, /** probing for mpeg4 data */
video_read_header,
raw_read_partial_packet,
raw_read_close,
.flags= AVFMT_GENERIC_INDEX,
.extensions = "m4v", //FIXME remove after writing mpeg4_probe
.value = CODEC_ID_MPEG4,
};
#ifdef CONFIG_MUXERS
AVOutputFormat m4v_muxer = {
"m4v",
"raw MPEG4 video format",
NULL,
"m4v",
0,
CODEC_ID_NONE,
CODEC_ID_MPEG4,
raw_write_header,
raw_write_packet,
raw_write_trailer,
.flags= AVFMT_NOTIMESTAMPS,
};
#endif //CONFIG_MUXERS
AVInputFormat h264_demuxer = {
"h264",
"raw H264 video format",
0,
NULL /*mpegvideo_probe*/,
video_read_header,
raw_read_partial_packet,
raw_read_close,
.flags= AVFMT_GENERIC_INDEX,
.extensions = "h26l,h264,264", //FIXME remove after writing mpeg4_probe
.value = CODEC_ID_H264,
};
#ifdef CONFIG_MUXERS
AVOutputFormat h264_muxer = {
"h264",
"raw H264 video format",
NULL,
"h264",
0,
CODEC_ID_NONE,
CODEC_ID_H264,
raw_write_header,
raw_write_packet,
raw_write_trailer,
.flags= AVFMT_NOTIMESTAMPS,
};
#endif //CONFIG_MUXERS
AVInputFormat mpegvideo_demuxer = {
"mpegvideo",
"MPEG video",
0,
mpegvideo_probe,
video_read_header,
raw_read_partial_packet,
raw_read_close,
.flags= AVFMT_GENERIC_INDEX,
.value = CODEC_ID_MPEG1VIDEO,
};
#ifdef CONFIG_MUXERS
AVOutputFormat mpeg1video_muxer = {
"mpeg1video",
"MPEG video",
"video/x-mpeg",
"mpg,mpeg,m1v",
0,
0,
CODEC_ID_MPEG1VIDEO,
raw_write_header,
raw_write_packet,
raw_write_trailer,
.flags= AVFMT_NOTIMESTAMPS,
};
#endif //CONFIG_MUXERS
#ifdef CONFIG_MUXERS
AVOutputFormat mpeg2video_muxer = {
"mpeg2video",
"MPEG2 video",
NULL,
"m2v",
0,
0,
CODEC_ID_MPEG2VIDEO,
raw_write_header,
raw_write_packet,
raw_write_trailer,
.flags= AVFMT_NOTIMESTAMPS,
};
#endif //CONFIG_MUXERS
AVInputFormat mjpeg_demuxer = {
"mjpeg",
"MJPEG video",
0,
NULL,
video_read_header,
raw_read_partial_packet,
raw_read_close,
.flags= AVFMT_GENERIC_INDEX,
.extensions = "mjpg,mjpeg",
.value = CODEC_ID_MJPEG,
};
AVInputFormat ingenient_demuxer = {
"ingenient",
"Ingenient MJPEG",
0,
NULL,
video_read_header,
ingenient_read_packet,
raw_read_close,
.flags= AVFMT_GENERIC_INDEX,
.extensions = "cgi", // FIXME
.value = CODEC_ID_MJPEG,
};
#ifdef CONFIG_MUXERS
AVOutputFormat mjpeg_muxer = {
"mjpeg",
"MJPEG video",
"video/x-mjpeg",
"mjpg,mjpeg",
0,
0,
CODEC_ID_MJPEG,
raw_write_header,
raw_write_packet,
raw_write_trailer,
.flags= AVFMT_NOTIMESTAMPS,
};
#endif //CONFIG_MUXERS
/* pcm formats */
#define PCMINPUTDEF(name, long_name, ext, codec) \
AVInputFormat pcm_ ## name ## _demuxer = {\
#name,\
long_name,\
0,\
NULL,\
raw_read_header,\
raw_read_packet,\
raw_read_close,\
pcm_read_seek,\
.flags= AVFMT_GENERIC_INDEX,\
.extensions = ext,\
.value = codec,\
};
#define PCMOUTPUTDEF(name, long_name, ext, codec) \
AVOutputFormat pcm_ ## name ## _muxer = {\
#name,\
long_name,\
NULL,\
ext,\
0,\
codec,\
0,\
raw_write_header,\
raw_write_packet,\
raw_write_trailer,\
.flags= AVFMT_NOTIMESTAMPS,\
};
#if !defined(CONFIG_MUXERS) && defined(CONFIG_DEMUXERS)
#define PCMDEF(name, long_name, ext, codec) \
PCMINPUTDEF(name, long_name, ext, codec)
#elif defined(CONFIG_MUXERS) && !defined(CONFIG_DEMUXERS)
#define PCMDEF(name, long_name, ext, codec) \
PCMOUTPUTDEF(name, long_name, ext, codec)
#elif defined(CONFIG_MUXERS) && defined(CONFIG_DEMUXERS)
#define PCMDEF(name, long_name, ext, codec) \
PCMINPUTDEF(name, long_name, ext, codec)\
PCMOUTPUTDEF(name, long_name, ext, codec)
#else
#define PCMDEF(name, long_name, ext, codec)
#endif
#ifdef WORDS_BIGENDIAN
#define BE_DEF(s) s
#define LE_DEF(s) NULL
#else
#define BE_DEF(s) NULL
#define LE_DEF(s) s
#endif
PCMDEF(s16le, "pcm signed 16 bit little endian format",
LE_DEF("sw"), CODEC_ID_PCM_S16LE)
PCMDEF(s16be, "pcm signed 16 bit big endian format",
BE_DEF("sw"), CODEC_ID_PCM_S16BE)
PCMDEF(u16le, "pcm unsigned 16 bit little endian format",
LE_DEF("uw"), CODEC_ID_PCM_U16LE)
PCMDEF(u16be, "pcm unsigned 16 bit big endian format",
BE_DEF("uw"), CODEC_ID_PCM_U16BE)
PCMDEF(s8, "pcm signed 8 bit format",
"sb", CODEC_ID_PCM_S8)
PCMDEF(u8, "pcm unsigned 8 bit format",
"ub", CODEC_ID_PCM_U8)
PCMDEF(mulaw, "pcm mu law format",
"ul", CODEC_ID_PCM_MULAW)
PCMDEF(alaw, "pcm A law format",
"al", CODEC_ID_PCM_ALAW)
static int rawvideo_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int packet_size, ret, width, height;
AVStream *st = s->streams[0];
width = st->codec->width;
height = st->codec->height;
packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);
if (packet_size < 0)
return -1;
ret= av_get_packet(&s->pb, pkt, packet_size);
pkt->stream_index = 0;
if (ret != packet_size) {
return AVERROR_IO;
} else {
return 0;
}
}
AVInputFormat rawvideo_demuxer = {
"rawvideo",
"raw video format",
0,
NULL,
raw_read_header,
rawvideo_read_packet,
raw_read_close,
.flags= AVFMT_GENERIC_INDEX,
.extensions = "yuv,cif,qcif",
.value = CODEC_ID_RAWVIDEO,
};
#ifdef CONFIG_MUXERS
AVOutputFormat rawvideo_muxer = {
"rawvideo",
"raw video format",
NULL,
"yuv",
0,
CODEC_ID_NONE,
CODEC_ID_RAWVIDEO,
raw_write_header,
raw_write_packet,
raw_write_trailer,
.flags= AVFMT_NOTIMESTAMPS,
};
#endif //CONFIG_MUXERS
#ifdef CONFIG_MUXERS
static int null_write_packet(struct AVFormatContext *s, AVPacket *pkt)
{
return 0;
}
AVOutputFormat null_muxer = {
"null",
"null video format",
NULL,
NULL,
0,
#ifdef WORDS_BIGENDIAN
CODEC_ID_PCM_S16BE,
#else
CODEC_ID_PCM_S16LE,
#endif
CODEC_ID_RAWVIDEO,
raw_write_header,
null_write_packet,
raw_write_trailer,
.flags = AVFMT_NOFILE | AVFMT_RAWPICTURE | AVFMT_NOTIMESTAMPS,
};
#endif //CONFIG_MUXERS
Reference in New Issue View Git Blame Copy Permalink