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https://github.com/FFmpeg/FFmpeg.git
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use consistant PTS handling - fixed MPEG2 Pack header generation (clock_ref value is still slightly inaccurate)
Originally committed as revision 1055 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard
parent
916c80e94a
commit
b2cac18443
65
libav/mpeg.c
65
libav/mpeg.c
@ -17,7 +17,6 @@
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "avformat.h"
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#include "tick.h"
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#define MAX_PAYLOAD_SIZE 4096
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#define NB_STREAMS 2
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@ -28,8 +27,6 @@ typedef struct {
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UINT8 id;
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int max_buffer_size; /* in bytes */
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int packet_number;
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INT64 pts;
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Ticker pts_ticker;
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INT64 start_pts;
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} StreamInfo;
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@ -77,17 +74,29 @@ static int put_pack_header(AVFormatContext *ctx,
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init_put_bits(&pb, buf, 128, NULL, NULL);
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put_bits(&pb, 32, PACK_START_CODE);
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put_bits(&pb, 4, 0x2);
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if (s->is_mpeg2) {
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put_bits(&pb, 2, 0x2);
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} else {
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put_bits(&pb, 4, 0x2);
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}
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put_bits(&pb, 3, (UINT32)((timestamp >> 30) & 0x07));
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put_bits(&pb, 1, 1);
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put_bits(&pb, 15, (UINT32)((timestamp >> 15) & 0x7fff));
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put_bits(&pb, 1, 1);
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put_bits(&pb, 15, (UINT32)((timestamp) & 0x7fff));
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put_bits(&pb, 1, 1);
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if (s->is_mpeg2) {
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/* clock extension */
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put_bits(&pb, 9, 0);
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put_bits(&pb, 1, 1);
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}
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put_bits(&pb, 1, 1);
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put_bits(&pb, 22, s->mux_rate);
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put_bits(&pb, 1, 1);
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if (s->is_mpeg2) {
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put_bits(&pb, 5, 0x1f); /* reserved */
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put_bits(&pb, 3, 0); /* stuffing length */
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}
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flush_put_bits(&pb);
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return pbBufPtr(&pb) - pb.buf;
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}
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@ -217,36 +226,20 @@ static int mpeg_mux_init(AVFormatContext *ctx)
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/* every 2 seconds */
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s->pack_header_freq = 2 * bitrate / s->packet_size / 8;
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if (s->is_vcd)
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if (s->is_mpeg2)
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/* every 200 packets. Need to look at the spec. */
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s->system_header_freq = s->pack_header_freq * 40;
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else if (s->is_vcd)
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/* every 40 packets, this is my invention */
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s->system_header_freq = s->pack_header_freq * 40;
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else
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/* every 10 seconds */
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s->system_header_freq = s->pack_header_freq * 5;
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for(i=0;i<ctx->nb_streams;i++) {
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stream = ctx->streams[i]->priv_data;
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stream->buffer_ptr = 0;
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stream->packet_number = 0;
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stream->pts = 0;
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stream->start_pts = -1;
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st = ctx->streams[i];
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switch (st->codec.codec_type) {
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case CODEC_TYPE_AUDIO:
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ticker_init(&stream->pts_ticker,
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st->codec.sample_rate,
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90000 * st->codec.frame_size);
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break;
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case CODEC_TYPE_VIDEO:
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ticker_init(&stream->pts_ticker,
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st->codec.frame_rate,
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90000 * FRAME_RATE_BASE);
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break;
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default:
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av_abort();
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}
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}
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return 0;
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fail:
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@ -354,7 +347,7 @@ static void flush_packet(AVFormatContext *ctx, int stream_index, int last_pkt)
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}
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static int mpeg_mux_write_packet(AVFormatContext *ctx, int stream_index,
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UINT8 *buf, int size, int force_pts)
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UINT8 *buf, int size, int pts)
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{
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MpegMuxContext *s = ctx->priv_data;
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AVStream *st = ctx->streams[stream_index];
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@ -364,9 +357,7 @@ static int mpeg_mux_write_packet(AVFormatContext *ctx, int stream_index,
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while (size > 0) {
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/* set pts */
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if (stream->start_pts == -1) {
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if (force_pts)
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stream->pts = force_pts;
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stream->start_pts = stream->pts;
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stream->start_pts = pts;
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}
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len = s->packet_data_max_size - stream->buffer_ptr;
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if (len > size)
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@ -378,16 +369,10 @@ static int mpeg_mux_write_packet(AVFormatContext *ctx, int stream_index,
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while (stream->buffer_ptr >= s->packet_data_max_size) {
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/* output the packet */
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if (stream->start_pts == -1)
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stream->start_pts = stream->pts;
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stream->start_pts = pts;
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flush_packet(ctx, stream_index, 0);
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}
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}
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stream->pts += ticker_tick(&stream->pts_ticker, 1);
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//if (st->codec.codec_type == CODEC_TYPE_VIDEO)
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// fprintf(stderr,"\nVideo PTS: %6lld", stream->pts);
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//else
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// fprintf(stderr,"\nAudio PTS: %6lld", stream->pts);
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return 0;
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}
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@ -510,7 +495,7 @@ static int mpegps_read_packet(AVFormatContext *s,
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int len, size, startcode, i, c, flags, header_len, type, codec_id;
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INT64 pts, dts;
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/* next start code (should be immediately after */
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/* next start code (should be immediately after) */
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redo:
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m->header_state = 0xff;
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size = MAX_SYNC_SIZE;
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@ -536,8 +521,8 @@ static int mpegps_read_packet(AVFormatContext *s,
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goto redo;
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len = get_be16(&s->pb);
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pts = 0;
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dts = 0;
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pts = AV_NOPTS_VALUE;
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dts = AV_NOPTS_VALUE;
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/* stuffing */
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for(;;) {
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c = get_byte(&s->pb);
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@ -555,7 +540,6 @@ static int mpegps_read_packet(AVFormatContext *s,
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if ((c & 0xf0) == 0x20) {
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pts = get_pts(&s->pb, c);
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len -= 4;
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dts = pts;
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} else if ((c & 0xf0) == 0x30) {
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pts = get_pts(&s->pb, c);
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dts = get_pts(&s->pb, -1);
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@ -573,7 +557,6 @@ static int mpegps_read_packet(AVFormatContext *s,
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goto redo;
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if ((flags & 0xc0) == 0x80) {
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pts = get_pts(&s->pb, -1);
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dts = pts;
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header_len -= 5;
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len -= 5;
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} if ((flags & 0xc0) == 0xc0) {
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