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Factor out extradata reading code. 

Borrowed from RM demuxer in FFmbc.

Originally committed as revision 20821 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kostya Shishkov 2009-12-13 10:07:08 +00:00
parent 119c61a30f
commit 0dae3e13e3
1 changed files with 22 additions and 17 deletions
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39
libavformat/rmdec.c
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@ -100,6 +100,20 @@ static void get_str8(ByteIOContext *pb, char *buf, int buf_size)
get_strl(pb, buf, buf_size, get_byte(pb));
}
static int rm_read_extradata(ByteIOContext *pb, AVCodecContext *avctx, unsigned size)
{
if (size >= 1<<24)
return -1;
avctx->extradata = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!avctx->extradata)
return AVERROR_NOMEM;
avctx->extradata_size = get_buffer(pb, avctx->extradata, size);
memset(avctx->extradata + avctx->extradata_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
if (avctx->extradata_size != size)
return AVERROR(EIO);
return 0;
}
static void rm_read_metadata(AVFormatContext *s, int wide)
{
char buf[1024];
@ -128,6 +142,7 @@ static int rm_read_audio_stream_info(AVFormatContext *s, ByteIOContext *pb,
{
char buf[256];
uint32_t version;
int ret;
/* ra type header */
version = get_be16(pb); /* version */
@ -230,9 +245,8 @@ static int rm_read_audio_stream_info(AVFormatContext *s, ByteIOContext *pb,
}
st->codec->block_align = ast->sub_packet_size;
}
st->codec->extradata_size= codecdata_length;
st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
if ((ret = rm_read_extradata(s->pb, st->codec, codecdata_length)) < 0)
return ret;
if(ast->audio_framesize >= UINT_MAX / sub_packet_h){
av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
@ -252,10 +266,9 @@ static int rm_read_audio_stream_info(AVFormatContext *s, ByteIOContext *pb,
return -1;
}
if (codecdata_length >= 1) {
st->codec->extradata_size = codecdata_length - 1;
st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
get_byte(pb);
get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
if ((ret = rm_read_extradata(s->pb, st->codec, codecdata_length - 1)) < 0)
return ret;
}
break;
default:
@ -278,6 +291,7 @@ ff_rm_read_mdpr_codecdata (AVFormatContext *s, ByteIOContext *pb,
unsigned int v;
int size;
int64_t codec_pos;
int ret;
av_set_pts_info(st, 64, 1, 1000);
codec_pos = url_ftell(pb);
@ -307,17 +321,8 @@ ff_rm_read_mdpr_codecdata (AVFormatContext *s, ByteIOContext *pb,
fps2= get_be16(pb);
get_be16(pb);
st->codec->extradata_size= codec_data_size - (url_ftell(pb) - codec_pos);
if(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
//check is redundant as get_buffer() will catch this
av_log(s, AV_LOG_ERROR, "st->codec->extradata_size too large\n");
return -1;
}
st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!st->codec->extradata)
return AVERROR(ENOMEM);
get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
if ((ret = rm_read_extradata(s->pb, st->codec, codec_data_size - (url_ftell(pb) - codec_pos))) < 0)
return ret;
// av_log(s, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);
st->codec->time_base.den = fps * st->codec->time_base.num;