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parse mpeg frame to get pict type and closed gop flag

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Originally committed as revision 5967 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Baptiste Coudurier 2006-08-09 10:48:32 +00:00
parent e38f34fd7f
commit 76c9cb0a7a
1 changed files with 19 additions and 5 deletions
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24
libavformat/gxfenc.c
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@ -40,6 +40,7 @@ typedef struct GXFStreamContext {
int bframes;
int p_per_gop;
int b_per_gop;
int closed_gop;
} GXFStreamContext;
typedef struct GXFContext {
@ -178,9 +179,9 @@ static int gxf_write_mpeg_auxiliary(ByteIOContext *pb, GXFStreamContext *ctx)
ctx->b_per_gop = 9; /* ensure value won't take more than one char */
}
size = snprintf(buffer, 1024, "Ver 1\nBr %.6f\nIpg 1\nPpi %d\nBpiop %d\n"
"Pix 0\nCf %d\nCg 1\nSl 7\nnl16 %d\nVi 1\nf1 1\n",
"Pix 0\nCf %d\nCg %d\nSl 7\nnl16 %d\nVi 1\nf1 1\n",
(float)ctx->codec->bit_rate, ctx->p_per_gop, ctx->b_per_gop,
ctx->codec->pix_fmt == PIX_FMT_YUV422P ? 2 : 1,
ctx->codec->pix_fmt == PIX_FMT_YUV422P ? 2 : 1, ctx->closed_gop,
ctx->codec->height / 16);
put_byte(pb, 0x4F);
put_byte(pb, size + 1);
@ -417,7 +418,7 @@ static int gxf_write_umf_media_mpeg(ByteIOContext *pb, GXFStreamContext *stream)
put_le32(pb, 2);
else
put_le32(pb, 1); /* default to 420 */
put_le32(pb, 1); /* closed = 1, open = 0, unknown = 255 */
put_le32(pb, stream->closed_gop); /* closed = 1, open = 0, unknown = 255 */
put_le32(pb, 3); /* top = 1, bottom = 2, frame = 3, unknown = 0 */
put_le32(pb, 1); /* I picture per GOP */
put_le32(pb, stream->p_per_gop);
@ -682,6 +683,18 @@ static int gxf_write_trailer(AVFormatContext *s)
return 0;
}
static int gxf_parse_mpeg_frame(GXFStreamContext *sc, const uint8_t *buf, int size)
{
uint32_t c=-1;
int i;
for(i=0; i<size-4 && c!=0x100; i++){
c = (c<<8) + buf[i];
if(c == 0x1B8) /* GOP start code */
sc->closed_gop= (buf[i+4]>>6)&1;
}
return (buf[i+1]>>3)&7;
}
static int gxf_write_media_preamble(ByteIOContext *pb, GXFContext *ctx, AVPacket *pkt, int size)
{
GXFStreamContext *sc = &ctx->streams[pkt->stream_index];
@ -693,10 +706,11 @@ static int gxf_write_media_preamble(ByteIOContext *pb, GXFContext *ctx, AVPacket
put_be16(pb, 0);
put_be16(pb, size / 2);
} else if (sc->codec->codec_id == CODEC_ID_MPEG2VIDEO) {
if (pkt->flags & PKT_FLAG_KEY) {
int frame_type = gxf_parse_mpeg_frame(sc, pkt->data, pkt->size);
if (frame_type == FF_I_TYPE) {
put_byte(pb, 0x0d);
sc->iframes++;
} else if (pkt->pts != pkt->dts) {
} else if (frame_type == FF_B_TYPE) {
put_byte(pb, 0x0f);
sc->bframes++;
} else {