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Code Issues Releases Activity

avformat: do not require a pixel/sample format if there is no decoder

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Also, do not keep trying to find and open a decoder in try_decode_frame() if
we already tried and failed once.

Fixes always searching until max_analyze_duration in
avformat_find_stream_info() when demuxing codecs without a decoder.
This commit is contained in:
Justin Ruggles 2012-02-27 18:02:10 -05:00
parent a7fa75684d
commit 8c1d6ac66a
2 changed files with 30 additions and 13 deletions
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1
libavformat/avformat.h
View File

@ -637,6 +637,7 @@ typedef struct AVStream {
double duration_error[MAX_STD_TIMEBASES];
int64_t codec_info_duration;
int nb_decoded_frames;
int found_decoder;
} *info;
int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */

42
libavformat/utils.c
View File

@ -2026,15 +2026,20 @@ static void estimate_timings(AVFormatContext *ic, int64_t old_offset)
}
}
static int has_codec_parameters(AVCodecContext *avctx)
static int has_codec_parameters(AVStream *st)
{
AVCodecContext *avctx = st->codec;
int val;
switch (avctx->codec_type) {
case AVMEDIA_TYPE_AUDIO:
val = avctx->sample_rate && avctx->channels && avctx->sample_fmt != AV_SAMPLE_FMT_NONE;
val = avctx->sample_rate && avctx->channels;
if (st->info->found_decoder >= 0 && avctx->sample_fmt == AV_SAMPLE_FMT_NONE)
return 0;
break;
case AVMEDIA_TYPE_VIDEO:
val = avctx->width && avctx->pix_fmt != PIX_FMT_NONE;
val = avctx->width;
if (st->info->found_decoder >= 0 && avctx->pix_fmt == PIX_FMT_NONE)
return 0;
break;
default:
val = 1;
@ -2057,14 +2062,16 @@ static int try_decode_frame(AVStream *st, AVPacket *avpkt, AVDictionary **option
AVFrame picture;
AVPacket pkt = *avpkt;
if (!avcodec_is_open(st->codec)) {
if (!avcodec_is_open(st->codec) && !st->info->found_decoder) {
AVDictionary *thread_opt = NULL;
codec = st->codec->codec ? st->codec->codec :
avcodec_find_decoder(st->codec->codec_id);
if (!codec)
if (!codec) {
st->info->found_decoder = -1;
return -1;
}
/* force thread count to 1 since the h264 decoder will not extract SPS
* and PPS to extradata during multi-threaded decoding */
@ -2072,13 +2079,20 @@ static int try_decode_frame(AVStream *st, AVPacket *avpkt, AVDictionary **option
ret = avcodec_open2(st->codec, codec, options ? options : &thread_opt);
if (!options)
av_dict_free(&thread_opt);
if (ret < 0)
if (ret < 0) {
st->info->found_decoder = -1;
return ret;
}
}
st->info->found_decoder = 1;
} else if (!st->info->found_decoder)
st->info->found_decoder = 1;
if (st->info->found_decoder < 0)
return -1;
while ((pkt.size > 0 || (!pkt.data && got_picture)) &&
ret >= 0 &&
(!has_codec_parameters(st->codec) ||
(!has_codec_parameters(st) ||
!has_decode_delay_been_guessed(st) ||
(!st->codec_info_nb_frames && st->codec->codec->capabilities & CODEC_CAP_CHANNEL_CONF))) {
got_picture = 0;
@ -2229,7 +2243,7 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
: &thread_opt);
//try to just open decoders, in case this is enough to get parameters
if(!has_codec_parameters(st->codec)){
if (!has_codec_parameters(st)) {
if (codec && !st->codec->codec)
avcodec_open2(st->codec, codec, options ? &options[i]
: &thread_opt);
@ -2256,7 +2270,7 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
int fps_analyze_framecount = 20;
st = ic->streams[i];
if (!has_codec_parameters(st->codec))
if (!has_codec_parameters(st))
break;
/* if the timebase is coarse (like the usual millisecond precision
of mkv), we need to analyze more frames to reliably arrive at
@ -2302,7 +2316,7 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
if (ret < 0) {
/* EOF or error*/
AVPacket empty_pkt = { 0 };
int err;
int err = 0;
av_init_packet(&empty_pkt);
ret = -1; /* we could not have all the codec parameters before EOF */
@ -2310,16 +2324,18 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
st = ic->streams[i];
/* flush the decoders */
if (st->info->found_decoder == 1) {
do {
err = try_decode_frame(st, &empty_pkt,
(options && i < orig_nb_streams) ?
&options[i] : NULL);
} while (err > 0 && !has_codec_parameters(st->codec));
} while (err > 0 && !has_codec_parameters(st));
}
if (err < 0) {
av_log(ic, AV_LOG_WARNING,
"decoding for stream %d failed\n", st->index);
} else if (!has_codec_parameters(st->codec)){
} else if (!has_codec_parameters(st)) {
char buf[256];
avcodec_string(buf, sizeof(buf), st->codec, 0);
av_log(ic, AV_LOG_WARNING,