mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-11-24 12:09:55 +00:00
suppress PTS in packets when not needed (slightly smaller files), fixed PTS generation in some cases, added provision for DTS generation, slightly better SCR generation (initial patch by Michel Bardiaux)
Originally committed as revision 2585 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michel Bardiaux
Fabrice Bellard
parent
8a56ac7b89
commit
27a206e031
@ -19,7 +19,6 @@
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#include "avformat.h"
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#define MAX_PAYLOAD_SIZE 4096
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#define NB_STREAMS 2
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//#define DEBUG_SEEK
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typedef struct {
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@ -29,6 +28,7 @@ typedef struct {
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int max_buffer_size; /* in bytes */
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int packet_number;
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int64_t start_pts;
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int64_t start_dts;
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} StreamInfo;
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typedef struct {
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@ -43,6 +43,9 @@ typedef struct {
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int video_bound;
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int is_mpeg2;
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int is_vcd;
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int scr_stream_index; /* stream from which the system clock is
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computed (VBR case) */
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int64_t last_scr; /* current system clock */
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} MpegMuxContext;
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#define PACK_START_CODE ((unsigned int)0x000001ba)
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@ -181,11 +184,14 @@ static int mpeg_mux_init(AVFormatContext *ctx)
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/* startcode(4) + length(2) + flags(1) */
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s->packet_data_max_size = s->packet_size - 7;
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if (s->is_mpeg2)
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s->packet_data_max_size -= 2;
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s->audio_bound = 0;
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s->video_bound = 0;
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mpa_id = AUDIO_ID;
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ac3_id = 0x80;
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mpv_id = VIDEO_ID;
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s->scr_stream_index = -1;
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for(i=0;i<ctx->nb_streams;i++) {
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st = ctx->streams[i];
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stream = av_mallocz(sizeof(StreamInfo));
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@ -203,6 +209,9 @@ static int mpeg_mux_init(AVFormatContext *ctx)
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s->audio_bound++;
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break;
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case CODEC_TYPE_VIDEO:
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/* by default, video is used for the SCR computation */
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if (s->scr_stream_index == -1)
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s->scr_stream_index = i;
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stream->id = mpv_id++;
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stream->max_buffer_size = 46 * 1024;
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s->video_bound++;
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@ -211,6 +220,9 @@ static int mpeg_mux_init(AVFormatContext *ctx)
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av_abort();
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}
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}
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/* if no SCR, use first stream (audio) */
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if (s->scr_stream_index == -1)
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s->scr_stream_index = 0;
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/* we increase slightly the bitrate to take into account the
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headers. XXX: compute it exactly */
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@ -245,8 +257,10 @@ static int mpeg_mux_init(AVFormatContext *ctx)
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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->start_pts = -1;
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stream->start_pts = AV_NOPTS_VALUE;
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stream->start_dts = AV_NOPTS_VALUE;
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}
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s->last_scr = 0;
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return 0;
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fail:
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for(i=0;i<ctx->nb_streams;i++) {
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@ -255,28 +269,37 @@ static int mpeg_mux_init(AVFormatContext *ctx)
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return -ENOMEM;
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}
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static inline void put_timestamp(ByteIOContext *pb, int id, int64_t timestamp)
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{
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put_byte(pb,
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(id << 4) |
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(((timestamp >> 30) & 0x07) << 1) |
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1);
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put_be16(pb, (uint16_t)((((timestamp >> 15) & 0x7fff) << 1) | 1));
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put_be16(pb, (uint16_t)((((timestamp) & 0x7fff) << 1) | 1));
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}
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/* flush the packet on stream stream_index */
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static void flush_packet(AVFormatContext *ctx, int stream_index)
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static void flush_packet(AVFormatContext *ctx, int stream_index,
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int64_t pts, int64_t dts, int64_t scr)
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{
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MpegMuxContext *s = ctx->priv_data;
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StreamInfo *stream = ctx->streams[stream_index]->priv_data;
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uint8_t *buf_ptr;
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int size, payload_size, startcode, id, len, stuffing_size, i, header_len;
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int64_t timestamp;
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uint8_t buffer[128];
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id = stream->id;
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timestamp = stream->start_pts;
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#if 0
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printf("packet ID=%2x PTS=%0.3f\n",
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id, timestamp / 90000.0);
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id, pts / 90000.0);
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#endif
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buf_ptr = buffer;
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if (((s->packet_number % s->pack_header_freq) == 0)) {
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/* output pack and systems header if needed */
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size = put_pack_header(ctx, buf_ptr, timestamp);
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size = put_pack_header(ctx, buf_ptr, scr);
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buf_ptr += size;
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if ((s->packet_number % s->system_header_freq) == 0) {
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size = put_system_header(ctx, buf_ptr);
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@ -288,10 +311,20 @@ static void flush_packet(AVFormatContext *ctx, int stream_index)
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/* packet header */
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if (s->is_mpeg2) {
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header_len = 8;
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header_len = 3;
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} else {
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header_len = 5;
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header_len = 0;
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}
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if (pts != AV_NOPTS_VALUE) {
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if (dts != AV_NOPTS_VALUE)
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header_len += 5 + 5;
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else
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header_len += 5;
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} else {
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if (!s->is_mpeg2)
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header_len++;
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}
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payload_size = s->packet_size - (size + 6 + header_len);
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if (id < 0xc0) {
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startcode = PRIVATE_STREAM_1;
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@ -312,15 +345,34 @@ static void flush_packet(AVFormatContext *ctx, int stream_index)
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if (s->is_mpeg2) {
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put_byte(&ctx->pb, 0x80); /* mpeg2 id */
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put_byte(&ctx->pb, 0x80); /* flags */
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put_byte(&ctx->pb, 0x05); /* header len (only pts is included) */
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if (pts != AV_NOPTS_VALUE) {
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if (dts != AV_NOPTS_VALUE) {
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put_byte(&ctx->pb, 0xc0); /* flags */
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put_byte(&ctx->pb, header_len - 3);
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put_timestamp(&ctx->pb, 0x03, pts);
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put_timestamp(&ctx->pb, 0x01, dts);
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} else {
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put_byte(&ctx->pb, 0x80); /* flags */
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put_byte(&ctx->pb, header_len - 3);
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put_timestamp(&ctx->pb, 0x02, pts);
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}
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} else {
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put_byte(&ctx->pb, 0x00); /* flags */
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put_byte(&ctx->pb, header_len - 3);
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}
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} else {
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if (pts != AV_NOPTS_VALUE) {
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if (dts != AV_NOPTS_VALUE) {
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put_timestamp(&ctx->pb, 0x03, pts);
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put_timestamp(&ctx->pb, 0x01, dts);
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} else {
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put_timestamp(&ctx->pb, 0x02, pts);
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}
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} else {
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put_byte(&ctx->pb, 0x0f);
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}
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}
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put_byte(&ctx->pb,
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(0x02 << 4) |
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(((timestamp >> 30) & 0x07) << 1) |
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1);
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put_be16(&ctx->pb, (uint16_t)((((timestamp >> 15) & 0x7fff) << 1) | 1));
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put_be16(&ctx->pb, (uint16_t)((((timestamp) & 0x7fff) << 1) | 1));
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if (startcode == PRIVATE_STREAM_1) {
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put_byte(&ctx->pb, id);
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@ -345,7 +397,6 @@ static void flush_packet(AVFormatContext *ctx, int stream_index)
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s->packet_number++;
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stream->packet_number++;
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stream->start_pts = -1;
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}
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static int mpeg_mux_write_packet(AVFormatContext *ctx, int stream_index,
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@ -354,13 +405,28 @@ static int mpeg_mux_write_packet(AVFormatContext *ctx, int stream_index,
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MpegMuxContext *s = ctx->priv_data;
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AVStream *st = ctx->streams[stream_index];
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StreamInfo *stream = st->priv_data;
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int64_t dts;
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int len;
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/* XXX: system clock should be computed precisely, especially for
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CBR case. The current mode gives at least something coherent */
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if (stream_index == s->scr_stream_index)
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s->last_scr = pts;
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#if 0
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printf("%d: pts=%0.3f scr=%0.3f\n",
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stream_index, pts / 90000.0, s->last_scr / 90000.0);
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#endif
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/* XXX: currently no way to pass dts, will change soon */
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dts = AV_NOPTS_VALUE;
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/* we assume here that pts != AV_NOPTS_VALUE */
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if (stream->start_pts == AV_NOPTS_VALUE) {
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stream->start_pts = pts;
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stream->start_dts = dts;
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}
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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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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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len = size;
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@ -370,9 +436,12 @@ static int mpeg_mux_write_packet(AVFormatContext *ctx, int stream_index,
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size -= len;
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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 = pts;
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flush_packet(ctx, stream_index);
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flush_packet(ctx, stream_index,
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stream->start_pts, stream->start_dts, s->last_scr);
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/* Make sure only the FIRST pes packet for this frame has
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a timestamp */
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stream->start_pts = AV_NOPTS_VALUE;
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stream->start_dts = AV_NOPTS_VALUE;
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}
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}
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return 0;
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@ -380,14 +449,15 @@ static int mpeg_mux_write_packet(AVFormatContext *ctx, int stream_index,
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static int mpeg_mux_end(AVFormatContext *ctx)
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{
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MpegMuxContext *s = ctx->priv_data;
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StreamInfo *stream;
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int i;
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/* flush each packet */
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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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if (stream->buffer_ptr > 0) {
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flush_packet(ctx, i);
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while (stream->buffer_ptr > 0) {
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flush_packet(ctx, i, AV_NOPTS_VALUE, AV_NOPTS_VALUE, s->last_scr);
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}
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}
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@ -676,7 +746,7 @@ static int mpegps_read_packet(AVFormatContext *s,
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len = mpegps_read_pes_header(s, NULL, &startcode, &pts, &dts, 1);
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if (len < 0)
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return len;
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/* now find stream */
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for(i=0;i<s->nb_streams;i++) {
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st = s->streams[i];
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@ -728,12 +798,14 @@ static int mpegps_read_packet(AVFormatContext *s,
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st->codec.bit_rate = st->codec.channels * st->codec.sample_rate * 2;
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}
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av_new_packet(pkt, len);
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//printf("\nRead Packet ID: %x PTS: %f Size: %d", startcode,
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// (float)pts/90000, len);
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get_buffer(&s->pb, pkt->data, pkt->size);
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pkt->pts = pts;
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pkt->dts = dts;
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pkt->stream_index = st->index;
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#if 0
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printf("%d: pts=%0.3f dts=%0.3f\n",
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pkt->stream_index, pkt->pts / 90000.0, pkt->dts / 90000.0);
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#endif
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return 0;
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}
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