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split mux/demux related structures - added file probing support - improve media file reading API

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Originally committed as revision 545 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard 2002-05-20 16:28:47 +00:00
parent fe9cf0d44e
commit b9a281db69
2 changed files with 668 additions and 183 deletions
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206
libav/avformat.h
View File

@ -24,10 +24,18 @@ int av_new_packet(AVPacket *pkt, int size);
void av_free_packet(AVPacket *pkt);
/*************************************************/
/* output formats */
/* input/output formats */
struct AVFormatContext;
struct AVFormatInputContext;
/* this structure contains the data a format has to probe a file */
typedef struct AVProbeData {
char *filename;
unsigned char *buf;
int buf_size;
} AVProbeData;
#define AVPROBE_SCORE_MAX 100
typedef struct AVFormatParameters {
int frame_rate;
@ -38,12 +46,21 @@ typedef struct AVFormatParameters {
enum PixelFormat pix_fmt;
} AVFormatParameters;
typedef struct AVFormat {
#define AVFMT_NOFILE 0x0001 /* no file should be opened */
#define AVFMT_NEEDNUMBER 0x0002 /* needs '%d' in filename */
#define AVFMT_NOHEADER 0x0004 /* signal that no header is present
(streams are added dynamically) */
#define AVFMT_SHOW_IDS 0x0008 /* show format stream IDs numbers */
#define AVFMT_RGB24 0x0010 /* force RGB24 output for ppm (hack
- need better api) */
typedef struct AVOutputFormat {
const char *name;
const char *long_name;
const char *mime_type;
const char *extensions; /* comma separated extensions */
/* size of private data so that it can be allocated in the wrapper */
int priv_data_size;
/* output support */
enum CodecID audio_codec; /* default audio codec */
enum CodecID video_codec; /* default video codec */
@ -52,14 +69,28 @@ typedef struct AVFormat {
int stream_index,
unsigned char *buf, int size, int force_pts);
int (*write_trailer)(struct AVFormatContext *);
/* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER */
int flags;
/* private fields */
struct AVOutputFormat *next;
} AVOutputFormat;
/* optional input support */
/* read the format header and initialize the AVFormatInputContext
typedef struct AVInputFormat {
const char *name;
const char *long_name;
/* size of private data so that it can be allocated in the wrapper */
int priv_data_size;
/* tell if a given file has a chance of being parsing by this format */
int (*read_probe)(AVProbeData *);
/* read the format header and initialize the AVFormatContext
structure. Return 0 if OK. 'ap' if non NULL contains
additionnal paramters. Only used in raw format right now */
additionnal paramters. Only used in raw format right
now. 'av_new_stream' should be called to create new streams. */
int (*read_header)(struct AVFormatContext *,
AVFormatParameters *ap);
/* read one packet and put it in 'pkt'. pts and flags are also set */
/* read one packet and put it in 'pkt'. pts and flags are also
set. 'av_new_stream' can be called only if the flag
AVFMT_NOHEADER is used. */
int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
/* close the stream. The AVFormatContext and AVStreams are not
freed by this function */
@ -67,24 +98,37 @@ typedef struct AVFormat {
/* seek at or before a given pts (given in microsecond). The pts
origin is defined by the stream */
int (*read_seek)(struct AVFormatContext *, INT64 pts);
/* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_NOHEADER */
int flags;
#define AVFMT_NOFILE 0x0001 /* no file should be opened */
#define AVFMT_NEEDNUMBER 0x0002 /* needs '%d' in filename */
struct AVFormat *next;
} AVFormat;
/* if extensions are defined, then no probe is done. You should
usually not use extension format guessing because it is not
reliable enough */
const char *extensions;
/* general purpose read only value that the format can use */
int value;
/* private fields */
struct AVInputFormat *next;
} AVInputFormat;
typedef struct AVStream {
int id; /* internal stream id */
int index; /* stream index in AVFormatContext */
int id; /* format specific stream id */
AVCodecContext codec; /* codec context */
int r_frame_rate; /* real frame rate of the stream */
void *priv_data;
/* internal data used in av_find_stream_info() */
int codec_info_state;
int codec_info_nb_repeat_frames;
int codec_info_nb_real_frames;
} AVStream;
#define MAX_STREAMS 20
/* format I/O context */
typedef struct AVFormatContext {
struct AVFormat *format;
/* can only be iformat or oformat, not both at the same time */
struct AVInputFormat *iformat;
struct AVOutputFormat *oformat;
void *priv_data;
ByteIOContext pb;
int nb_streams;
@ -107,86 +151,76 @@ typedef struct AVPacketList {
struct AVPacketList *next;
} AVPacketList;
extern AVFormat *first_format;
extern AVInputFormat *first_iformat;
extern AVOutputFormat *first_oformat;
/* rv10enc.c */
extern AVFormat rm_format;
/* XXX: use automatic init with either ELF sections or C file parser */
/* modules */
/* mpegmux.c */
/* mpeg.c */
#define AVF_FLAG_VCD 0x00000001 /* VCD compatible MPEG-PS */
extern AVFormat mpeg_mux_format;
int mpegps_init(void);
/* asfenc.c */
extern AVFormat asf_format;
/* mpegts.c */
extern AVInputFormat mpegts_demux;
int mpegts_init(void);
/* avienc.c */
extern AVFormat avi_format;
/* mov.c */
extern AVFormat mov_format;
extern AVFormat mp4_format;
/* jpegenc.c */
extern AVFormat mpjpeg_format;
extern AVFormat jpeg_format;
extern AVFormat single_jpeg_format;
/* swfenc.c */
extern AVFormat swf_format;
/* gif.c */
extern AVFormat gif_format;
/* au.c */
extern AVFormat au_format;
/* wav.c */
extern AVFormat wav_format;
/* rm.c */
int rm_init(void);
/* crc.c */
extern AVFormat crc_format;
int crc_init(void);
/* img.c */
extern AVFormat pgm_format;
extern AVFormat ppm_format;
extern AVFormat pgmyuv_format;
extern AVFormat imgyuv_format;
int img_init(void);
extern AVFormat pgmpipe_format;
extern AVFormat pgmyuvpipe_format;
extern AVFormat ppmpipe_format;
/* asf.c */
int asf_init(void);
/* avienc.c */
int avienc_init(void);
/* avidec.c */
int avidec_init(void);
/* swf.c */
int swf_init(void);
/* mov.c */
int mov_init(void);
/* jpeg.c */
int jpeg_init(void);
/* gif.c */
int gif_init(void);
/* au.c */
int au_init(void);
/* wav.c */
int wav_init(void);
/* raw.c */
extern AVFormat mp2_format;
extern AVFormat ac3_format;
extern AVFormat h263_format;
extern AVFormat mpeg1video_format;
extern AVFormat mjpeg_format;
extern AVFormat pcm_s16le_format;
extern AVFormat pcm_s16be_format;
extern AVFormat pcm_u16le_format;
extern AVFormat pcm_u16be_format;
extern AVFormat pcm_s8_format;
extern AVFormat pcm_u8_format;
extern AVFormat pcm_mulaw_format;
extern AVFormat pcm_alaw_format;
extern AVFormat rawvideo_format;
int raw_init(void);
/* ffm.c */
extern AVFormat ffm_format;
/* formats.c */
int ffm_init(void);
/* utils.c */
#define MKTAG(a,b,c,d) (a | (b << 8) | (c << 16) | (d << 24))
#define MKBETAG(a,b,c,d) (d | (c << 8) | (b << 16) | (a << 24))
void register_avformat(AVFormat *format);
AVFormat *guess_format(const char *short_name, const char *filename, const char *mime_type);
void av_register_input_format(AVInputFormat *format);
void av_register_output_format(AVOutputFormat *format);
AVOutputFormat *guess_format(const char *short_name,
const char *filename, const char *mime_type);
int strstart(const char *str, const char *val, const char **ptr);
void nstrcpy(char *buf, int buf_size, const char *str);
/* This does what strncpy ought to do. */
void strlcpy(char *dst, const char *src, int dst_size);
void pstrcpy(char *buf, int buf_size, const char *str);
int match_ext(const char *filename, const char *extensions);
void av_hex_dump(UINT8 *buf, int size);
void register_all(void);
@ -203,14 +237,29 @@ int fifo_size(FifoBuffer *f, UINT8 *rptr);
int fifo_read(FifoBuffer *f, UINT8 *buf, int buf_size, UINT8 **rptr_ptr);
void fifo_write(FifoBuffer *f, UINT8 *buf, int size, UINT8 **wptr_ptr);
AVFormatContext *av_open_input_file(const char *filename,
const char *format_name,
/* media file input */
AVInputFormat *av_find_input_format(const char *short_name);
int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
AVInputFormat *fmt,
int buf_size,
AVFormatParameters *ap);
#define AVERROR_UNKNOWN (-1) /* unknown error */
#define AVERROR_IO (-2) /* i/o error */
#define AVERROR_NUMEXPECTED (-3) /* number syntax expected in filename */
#define AVERROR_INVALIDDATA (-4) /* invalid data found */
#define AVERROR_NOMEM (-5) /* not enough memory */
#define AVERROR_NOFMT (-6) /* unknown format */
int av_find_stream_info(AVFormatContext *ic);
int av_read_packet(AVFormatContext *s, AVPacket *pkt);
void av_close_input_file(AVFormatContext *s);
AVStream *av_new_stream(AVFormatContext *s, int id);
/* media file output */
int av_write_header(AVFormatContext *s);
int av_write_packet(AVFormatContext *s, AVPacket *pkt, int force_pts);
int av_write_trailer(AVFormatContext *s);
void dump_format(AVFormatContext *ic,
int index,
@ -230,10 +279,11 @@ int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
int get_frame_filename(char *buf, int buf_size,
const char *path, int number);
int filename_number_test(const char *filename);
/* grab/output specific */
extern AVFormat video_grab_device_format;
extern AVFormat audio_device_format;
/* grab specific */
int video_grab_init(void);
int audio_init(void);
extern const char *v4l_device;
extern const char *audio_device;

631
libav/utils.c
View File

@ -1,6 +1,6 @@
/*
* Various utilities for ffmpeg system
* Copyright (c) 2000,2001 Gerard Lantau
* Copyright (c) 2000, 2001, 2002 Gerard Lantau
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -29,12 +29,22 @@
#include <sys/timeb.h>
#endif
AVFormat *first_format;
AVInputFormat *first_iformat;
AVOutputFormat *first_oformat;
void register_avformat(AVFormat *format)
void av_register_input_format(AVInputFormat *format)
{
AVFormat **p;
p = &first_format;
AVInputFormat **p;
p = &first_iformat;
while (*p != NULL) p = &(*p)->next;
*p = format;
format->next = NULL;
}
void av_register_output_format(AVOutputFormat *format)
{
AVOutputFormat **p;
p = &first_oformat;
while (*p != NULL) p = &(*p)->next;
*p = format;
format->next = NULL;
@ -64,15 +74,16 @@ int match_ext(const char *filename, const char *extensions)
return 0;
}
AVFormat *guess_format(const char *short_name, const char *filename, const char *mime_type)
AVOutputFormat *guess_format(const char *short_name, const char *filename,
const char *mime_type)
{
AVFormat *fmt, *fmt_found;
AVOutputFormat *fmt, *fmt_found;
int score_max, score;
/* find the proper file type */
fmt_found = NULL;
score_max = 0;
fmt = first_format;
fmt = first_oformat;
while (fmt != NULL) {
score = 0;
if (fmt->name && short_name && !strcmp(fmt->name, short_name))
@ -92,8 +103,26 @@ AVFormat *guess_format(const char *short_name, const char *filename, const char
return fmt_found;
}
/* return TRUE if val is a prefix of str. If it returns TRUE, ptr is
set to the next character in 'str' after the prefix */
AVInputFormat *av_find_input_format(const char *short_name)
{
AVInputFormat *fmt;
for(fmt = first_iformat; fmt != NULL; fmt = fmt->next) {
if (!strcmp(fmt->name, short_name))
return fmt;
}
return NULL;
}
/**
* Return TRUE if val is a prefix of str. If it returns TRUE, ptr is
* set to the next character in 'str' after the prefix.
*
* @param str input string
* @param val prefix to test
* @param ptr updated after the prefix in str in there is a match
* @return TRUE if there is a match
*/
int strstart(const char *str, const char *val, const char **ptr)
{
const char *p, *q;
@ -110,7 +139,17 @@ int strstart(const char *str, const char *val, const char **ptr)
return 1;
}
void nstrcpy(char *buf, int buf_size, const char *str)
/**
* Copy the string str to buf. If str length is bigger than buf_size -
* 1 then it is clamped to buf_size - 1.
* NOTE: this function does what strncpy should have done to be
* useful. NEVER use strncpy.
*
* @param buf destination buffer
* @param buf_size size of destination buffer
* @param str source string
*/
void pstrcpy(char *buf, int buf_size, const char *str)
{
int c;
char *q = buf;
@ -124,67 +163,34 @@ void nstrcpy(char *buf, int buf_size, const char *str)
*q = '\0';
}
void strlcpy(char *dst, const char *src, int len)
{
int slen = strlen(src) + 1;
if (slen <= len) {
memcpy(dst, src, slen);
} else {
memcpy(dst, src, len - 1);
dst[len - 1] = 0;
}
}
void register_all(void)
{
avcodec_init();
avcodec_register_all();
register_avformat(&mp2_format);
register_avformat(&ac3_format);
register_avformat(&mpeg_mux_format);
register_avformat(&mpeg1video_format);
register_avformat(&mjpeg_format);
register_avformat(&h263_format);
register_avformat(&rm_format);
register_avformat(&asf_format);
register_avformat(&avi_format);
register_avformat(&mov_format);
register_avformat(&mp4_format);
register_avformat(&mpjpeg_format);
register_avformat(&jpeg_format);
register_avformat(&single_jpeg_format);
register_avformat(&swf_format);
register_avformat(&gif_format);
register_avformat(&au_format);
register_avformat(&wav_format);
register_avformat(&crc_format);
mpegps_init();
mpegts_init();
crc_init();
img_init();
raw_init();
rm_init();
asf_init();
avienc_init();
avidec_init();
wav_init();
swf_init();
au_init();
gif_init();
mov_init();
jpeg_init();
register_avformat(&pcm_s16le_format);
register_avformat(&pcm_s16be_format);
register_avformat(&pcm_u16le_format);
register_avformat(&pcm_u16be_format);
register_avformat(&pcm_s8_format);
register_avformat(&pcm_u8_format);
register_avformat(&pcm_mulaw_format);
register_avformat(&pcm_alaw_format);
register_avformat(&rawvideo_format);
#ifndef CONFIG_WIN32
register_avformat(&ffm_format);
ffm_init();
#endif
register_avformat(&pgm_format);
register_avformat(&ppm_format);
register_avformat(&pgmyuv_format);
register_avformat(&imgyuv_format);
register_avformat(&pgmpipe_format);
register_avformat(&pgmyuvpipe_format);
register_avformat(&ppmpipe_format);
#ifdef CONFIG_GRAB
register_avformat(&video_grab_device_format);
register_avformat(&audio_device_format);
video_grab_init();
audio_init();
#endif
/* file protocols */
register_protocol(&file_protocol);
register_protocol(&pipe_protocol);
@ -196,11 +202,18 @@ void register_all(void)
/* memory handling */
/**
* Allocate the payload of a packet and intialized its fields to default values.
*
* @param pkt packet
* @param size wanted payload size
* @return 0 if OK. AVERROR_xxx otherwise.
*/
int av_new_packet(AVPacket *pkt, int size)
{
pkt->data = av_malloc(size);
if (!pkt->data)
return -ENOMEM;
return AVERROR_NOMEM;
pkt->size = size;
/* sane state */
pkt->pts = 0;
@ -209,6 +222,11 @@ int av_new_packet(AVPacket *pkt, int size)
return 0;
}
/**
* Free a packet
*
* @param pkt packet to free
*/
void av_free_packet(AVPacket *pkt)
{
av_freep(&pkt->data);
@ -293,61 +311,146 @@ void fifo_write(FifoBuffer *f, UINT8 *buf, int size, UINT8 **wptr_ptr)
*wptr_ptr = wptr;
}
/* media file handling.
'filename' is the filename to open.
'format_name' is used to force the file format (NULL if auto guess).
'buf_size' is the optional buffer size (zero if default is OK).
'ap' are additionnal parameters needed when opening the file (NULL if default).
*/
int filename_number_test(const char *filename)
{
char buf[1024];
return get_frame_filename(buf, sizeof(buf), filename, 1);
}
AVFormatContext *av_open_input_file(const char *filename,
const char *format_name,
/* guess file format */
static AVInputFormat *probe_input_format(AVProbeData *pd, int is_opened)
{
AVInputFormat *fmt1, *fmt;
int score, score_max;
fmt = NULL;
score_max = 0;
for(fmt1 = first_iformat; fmt1 != NULL; fmt1 = fmt1->next) {
if (!is_opened && !(fmt1->flags & AVFMT_NOFILE))
continue;
score = 0;
if (fmt1->extensions) {
if (match_ext(pd->filename, fmt1->extensions)) {
score = 50;
}
} else if (fmt1->read_probe) {
score = fmt1->read_probe(pd);
}
if (score > score_max) {
score_max = score;
fmt = fmt1;
}
}
return fmt;
}
/************************************************************/
/* input media file */
#define PROBE_BUF_SIZE 2048
/**
* Open a media file as input. The codec are not opened. Only the file
* header (if present) is read.
*
* @param ic_ptr the opened media file handle is put here
* @param filename filename to open.
* @param fmt if non NULL, force the file format to use
* @param buf_size optional buffer size (zero if default is OK)
* @param ap additionnal parameters needed when opening the file (NULL if default)
* @return 0 if OK. AVERROR_xxx otherwise.
*/
int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
AVInputFormat *fmt,
int buf_size,
AVFormatParameters *ap)
{
AVFormat *fmt;
AVFormatContext *ic = NULL;
int err;
char buf[PROBE_BUF_SIZE];
AVProbeData probe_data, *pd = &probe_data;
ic = av_mallocz(sizeof(AVFormatContext));
if (!ic)
if (!ic) {
err = AVERROR_NOMEM;
goto fail;
}
pstrcpy(ic->filename, sizeof(ic->filename), filename);
pd->filename = ic->filename;
pd->buf = buf;
pd->buf_size = 0;
/* find format */
if (format_name != NULL) {
fmt = guess_format(format_name, NULL, NULL);
} else {
fmt = guess_format(NULL, filename, NULL);
if (!fmt) {
/* guess format if no file can be opened */
fmt = probe_input_format(pd, 0);
}
if (!fmt || !fmt->read_header) {
return NULL;
}
ic->format = fmt;
/* if no file needed do not try to open one */
if (!(fmt->flags & AVFMT_NOFILE)) {
if (url_fopen(&ic->pb, filename, URL_RDONLY) < 0)
if (!fmt || !(fmt->flags & AVFMT_NOFILE)) {
if (url_fopen(&ic->pb, filename, URL_RDONLY) < 0) {
err = AVERROR_IO;
goto fail;
}
if (buf_size > 0) {
url_setbufsize(&ic->pb, buf_size);
}
/* read probe data */
pd->buf_size = get_buffer(&ic->pb, buf, PROBE_BUF_SIZE);
url_fseek(&ic->pb, 0, SEEK_SET);
}
err = ic->format->read_header(ic, ap);
if (err < 0) {
if (!(fmt->flags & AVFMT_NOFILE)) {
url_fclose(&ic->pb);
/* guess file format */
if (!fmt) {
fmt = probe_input_format(pd, 1);
}
/* if still no format found, error */
if (!fmt) {
err = AVERROR_NOFMT;
goto fail;
}
return ic;
ic->iformat = fmt;
/* allocate private data */
ic->priv_data = av_mallocz(fmt->priv_data_size);
if (!ic->priv_data) {
err = AVERROR_NOMEM;
goto fail;
}
/* check filename in case of an image number is expected */
if (ic->iformat->flags & AVFMT_NEEDNUMBER) {
if (filename_number_test(ic->filename) < 0) {
err = AVERROR_NUMEXPECTED;
goto fail1;
}
}
err = ic->iformat->read_header(ic, ap);
if (err < 0)
goto fail1;
*ic_ptr = ic;
return 0;
fail1:
if (!(fmt->flags & AVFMT_NOFILE)) {
url_fclose(&ic->pb);
}
fail:
if (ic) {
av_free(ic->priv_data);
}
av_free(ic);
return NULL;
*ic_ptr = NULL;
return err;
}
/**
* Read a packet from a media file
* @param s media file handle
* @param pkt is filled
* @return 0 if OK. AVERROR_xxx if error.
*/
int av_read_packet(AVFormatContext *s, AVPacket *pkt)
{
AVPacketList *pktl;
@ -360,16 +463,240 @@ int av_read_packet(AVFormatContext *s, AVPacket *pkt)
av_free(pktl);
return 0;
} else {
return s->format->read_packet(s, pkt);
return s->iformat->read_packet(s, pkt);
}
}
/* state for codec information */
#define CSTATE_NOTFOUND 0
#define CSTATE_DECODING 1
#define CSTATE_FOUND 2
static int has_codec_parameters(AVCodecContext *enc)
{
int val;
switch(enc->codec_type) {
case CODEC_TYPE_AUDIO:
val = enc->sample_rate;
break;
case CODEC_TYPE_VIDEO:
val = enc->width;
break;
default:
val = 1;
break;
}
return (val != 0);
}
/**
* Read the beginning of a media file to get stream information. This
* is useful for file formats with no headers such as MPEG. This
* function also compute the real frame rate in case of mpeg2 repeat
* frame mode.
*
* @param ic media file handle
* @return >=0 if OK. AVERROR_xxx if error.
*/
int av_find_stream_info(AVFormatContext *ic)
{
int i, count, ret, got_picture, size, read_size;
AVCodec *codec;
AVStream *st;
AVPacket *pkt;
AVPicture picture;
AVPacketList *pktl=NULL, **ppktl;
short samples[AVCODEC_MAX_AUDIO_FRAME_SIZE / 2];
UINT8 *ptr;
int min_read_size, max_read_size;
/* typical mpeg ts rate is 40 Mbits. DVD rate is about 10
Mbits. We read at most 0.1 second of file to find all streams */
/* XXX: base it on stream bitrate when possible */
if (ic->iformat == &mpegts_demux) {
/* maximum number of bytes we accept to read to find all the streams
in a file */
min_read_size = 3000000;
} else {
min_read_size = 125000;
}
/* max read size is 2 seconds of video max */
max_read_size = min_read_size * 20;
/* set initial codec state */
for(i=0;i<ic->nb_streams;i++) {
st = ic->streams[i];
if (has_codec_parameters(&st->codec))
st->codec_info_state = CSTATE_FOUND;
else
st->codec_info_state = CSTATE_NOTFOUND;
st->codec_info_nb_repeat_frames = 0;
st->codec_info_nb_real_frames = 0;
}
count = 0;
read_size = 0;
ppktl = &ic->packet_buffer;
for(;;) {
/* check if one codec still needs to be handled */
for(i=0;i<ic->nb_streams;i++) {
st = ic->streams[i];
if (st->codec_info_state != CSTATE_FOUND)
break;
}
if (i == ic->nb_streams) {
/* NOTE: if the format has no header, then we need to read
some packets to get most of the streams, so we cannot
stop here */
if (!(ic->iformat->flags & AVFMT_NOHEADER) ||
read_size >= min_read_size) {
/* if we found the info for all the codecs, we can stop */
ret = count;
break;
}
} else {
/* we did not get all the codec info, but we read too much data */
if (read_size >= max_read_size) {
ret = count;
break;
}
}
pktl = av_mallocz(sizeof(AVPacketList));
if (!pktl) {
ret = AVERROR_NOMEM;
break;
}
/* add the packet in the buffered packet list */
*ppktl = pktl;
ppktl = &pktl->next;
/* NOTE: a new stream can be added there if no header in file
(AVFMT_NOHEADER) */
pkt = &pktl->pkt;
if (ic->iformat->read_packet(ic, pkt) < 0) {
/* EOF or error */
ret = -1; /* we could not have all the codec parameters before EOF */
if ((ic->iformat->flags & AVFMT_NOHEADER) &&
i == ic->nb_streams)
ret = 0;
break;
}
read_size += pkt->size;
/* open new codecs */
for(i=0;i<ic->nb_streams;i++) {
st = ic->streams[i];
if (st->codec_info_state == CSTATE_NOTFOUND) {
/* set to found in case of error */
st->codec_info_state = CSTATE_FOUND;
codec = avcodec_find_decoder(st->codec.codec_id);
if (codec) {
ret = avcodec_open(&st->codec, codec);
if (ret >= 0)
st->codec_info_state = CSTATE_DECODING;
}
}
}
st = ic->streams[pkt->stream_index];
if (st->codec_info_state == CSTATE_DECODING) {
/* decode the data and update codec parameters */
ptr = pkt->data;
size = pkt->size;
while (size > 0) {
switch(st->codec.codec_type) {
case CODEC_TYPE_VIDEO:
ret = avcodec_decode_video(&st->codec, &picture,
&got_picture, ptr, size);
break;
case CODEC_TYPE_AUDIO:
ret = avcodec_decode_audio(&st->codec, samples,
&got_picture, ptr, size);
break;
default:
ret = -1;
break;
}
if (ret < 0) {
/* if error, simply ignore because another packet
may be OK */
break;
}
if (got_picture) {
/* we got the parameters - now we can stop
examining this stream */
/* XXX: add a codec info so that we can decide if
the codec can repeat frames */
if (st->codec.codec_id == CODEC_ID_MPEG1VIDEO &&
ic->iformat != &mpegts_demux &&
st->codec.sub_id == 2) {
/* for mpeg2 video, we want to know the real
frame rate, so we decode 40 frames. In mpeg
TS case we do not do it because it would be
too long */
st->codec_info_nb_real_frames++;
st->codec_info_nb_repeat_frames += st->codec.repeat_pict;
#if 0
/* XXX: testing */
if ((st->codec_info_nb_real_frames % 24) == 23) {
st->codec_info_nb_repeat_frames += 2;
}
#endif
/* stop after 40 frames */
if (st->codec_info_nb_real_frames >= 40) {
st->r_frame_rate = (st->codec.frame_rate *
st->codec_info_nb_real_frames) /
(st->codec_info_nb_real_frames +
(st->codec_info_nb_repeat_frames >> 1));
goto close_codec;
}
} else {
close_codec:
st->codec_info_state = CSTATE_FOUND;
avcodec_close(&st->codec);
}
break;
}
ptr += ret;
size -= ret;
}
}
count++;
}
/* close each codec if there are opened */
for(i=0;i<ic->nb_streams;i++) {
st = ic->streams[i];
if (st->codec_info_state == CSTATE_DECODING)
avcodec_close(&st->codec);
}
/* set real frame rate info */
for(i=0;i<ic->nb_streams;i++) {
st = ic->streams[i];
if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
if (!st->r_frame_rate)
st->r_frame_rate = st->codec.frame_rate;
}
}
return ret;
}
/**
* Close a media file (but not its codecs)
*
* @param s media file handle
*/
void av_close_input_file(AVFormatContext *s)
{
int i;
if (s->format->read_close)
s->format->read_close(s);
if (s->iformat->read_close)
s->iformat->read_close(s);
for(i=0;i<s->nb_streams;i++) {
av_free(s->streams[i]);
}
@ -384,17 +711,81 @@ void av_close_input_file(AVFormatContext *s)
}
s->packet_buffer = NULL;
}
if (!(s->format->flags & AVFMT_NOFILE)) {
if (!(s->iformat->flags & AVFMT_NOFILE)) {
url_fclose(&s->pb);
}
av_free(s->priv_data);
av_free(s);
}
/**
* Add a new stream to a media file. Can only be called in the
* read_header function. If the flag AVFMT_NOHEADER is in the format
* description, then new streams can be added in read_packet too.
*
*
* @param s media file handle
* @param id file format dependent stream id
*/
AVStream *av_new_stream(AVFormatContext *s, int id)
{
AVStream *st;
if (s->nb_streams >= MAX_STREAMS)
return NULL;
st = av_mallocz(sizeof(AVStream));
if (!st)
return NULL;
st->index = s->nb_streams;
st->id = id;
s->streams[s->nb_streams++] = st;
return st;
}
/************************************************************/
/* output media file */
/**
* allocate the stream private data and write the stream header to an
* output media file
*
* @param s media file handle
* @return 0 if OK. AVERROR_xxx if error.
*/
int av_write_header(AVFormatContext *s)
{
s->priv_data = av_mallocz(s->oformat->priv_data_size);
if (!s->priv_data)
return AVERROR_NOMEM;
return s->oformat->write_header(s);
}
/**
* write a packet to an output media file
*
* @param s media file handle
* @param pkt packet to write
* @param force_pts XXX: need to suppress that
*/
int av_write_packet(AVFormatContext *s, AVPacket *pkt, int force_pts)
{
/* XXX: currently, an emulation because internal API must change */
return s->format->write_packet(s, pkt->stream_index, pkt->data, pkt->size, force_pts);
return s->oformat->write_packet(s, pkt->stream_index, pkt->data, pkt->size, force_pts);
}
/**
* write the stream trailer to an output media file and and free the
* file private data.
*
* @param s media file handle
* @return 0 if OK. AVERROR_xxx if error. */
int av_write_trailer(AVFormatContext *s)
{
int ret;
ret = s->oformat->write_trailer(s);
av_freep(&s->priv_data);
return ret;
}
/* "user interface" functions */
@ -404,17 +795,28 @@ void dump_format(AVFormatContext *ic,
const char *url,
int is_output)
{
int i;
int i, flags;
char buf[256];
fprintf(stderr, "%s #%d, %s, %s '%s':\n",
is_output ? "Output" : "Input",
index, ic->format->name,
index,
is_output ? ic->oformat->name : ic->iformat->name,
is_output ? "to" : "from", url);
for(i=0;i<ic->nb_streams;i++) {
AVStream *st = ic->streams[i];
avcodec_string(buf, sizeof(buf), &st->codec, is_output);
fprintf(stderr, " Stream #%d.%d: %s\n", index, i, buf);
fprintf(stderr, " Stream #%d.%d", index, i);
/* the pid is an important information, so we display it */
/* XXX: add a generic system */
if (is_output)
flags = ic->oformat->flags;
else
flags = ic->iformat->flags;
if (flags & AVFMT_SHOW_IDS) {
fprintf(stderr, "[0x%x]", st->id);
}
fprintf(stderr, ": %s\n", buf);
}
}
@ -661,3 +1063,36 @@ void ticker_init(Ticker *tick, INT64 inrate, INT64 outrate)
tick->div = tick->outrate / tick->inrate;
tick->mod = tick->outrate % tick->inrate;
}
/**
*
* Print on stdout a nice hexa dump of a buffer
* @param buf buffer
* @param size buffer size
*/
void av_hex_dump(UINT8 *buf, int size)
{
int len, i, j, c;
for(i=0;i<size;i+=16) {
len = size - i;
if (len > 16)
len = 16;
printf("%08x ", i);
for(j=0;j<16;j++) {
if (j < len)
printf(" %02x", buf[i+j]);
else
printf(" ");
}
printf(" ");
for(j=0;j<len;j++) {
c = buf[i+j];
if (c < ' ' || c > '~')
c = '.';
printf("%c", c);
}
printf("\n");
}
}