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avcodec/nvenc: Refactor timestamp generation logic

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Directly adapted from libav
This commit is contained in:
Timo Rothenpieler 2016-05-31 18:59:35 +02:00
parent 69c25c0ad7
commit e5babccfbc
2 changed files with 39 additions and 17 deletions
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51
libavcodec/nvenc.c
View File

@ -828,8 +828,6 @@ static av_cold int nvenc_setup_encoder(AVCodecContext *avctx)
int res = 0;
int dw, dh;
ctx->last_dts = AV_NOPTS_VALUE;
ctx->encode_config.version = NV_ENC_CONFIG_VER;
ctx->init_encode_params.version = NV_ENC_INITIALIZE_PARAMS_VER;
@ -897,9 +895,8 @@ static av_cold int nvenc_setup_encoder(AVCodecContext *avctx)
ctx->encode_config.gopLength = 1;
}
/* when there're b frames, set dts offset */
if (ctx->encode_config.frameIntervalP >= 2)
ctx->last_dts = -2;
ctx->initial_pts[0] = AV_NOPTS_VALUE;
ctx->initial_pts[1] = AV_NOPTS_VALUE;
nvenc_setup_rate_control(avctx);
@ -1419,19 +1416,30 @@ static int nvenc_set_timestamp(AVCodecContext *avctx,
pkt->pts = params->outputTimeStamp;
pkt->duration = params->outputDuration;
/* generate the first dts by linearly extrapolating the
* first two pts values to the past */
if (avctx->max_b_frames > 0 && !ctx->first_packet_output &&
ctx->initial_pts[1] != AV_NOPTS_VALUE) {
int64_t ts0 = ctx->initial_pts[0], ts1 = ctx->initial_pts[1];
int64_t delta;
if ((ts0 < 0 && ts1 > INT64_MAX + ts0) ||
(ts0 > 0 && ts1 < INT64_MIN + ts0))
return AVERROR(ERANGE);
delta = ts1 - ts0;
if ((delta < 0 && ts0 > INT64_MAX + delta) ||
(delta > 0 && ts0 < INT64_MIN + delta))
return AVERROR(ERANGE);
pkt->dts = ts0 - delta;
ctx->first_packet_output = 1;
return 0;
}
pkt->dts = timestamp_queue_dequeue(ctx->timestamp_list);
/* when there're b frame(s), set dts offset */
if (ctx->encode_config.frameIntervalP >= 2)
pkt->dts -= 1;
if (pkt->dts > pkt->pts)
pkt->dts = pkt->pts;
if (ctx->last_dts != AV_NOPTS_VALUE && pkt->dts <= ctx->last_dts)
pkt->dts = ctx->last_dts + 1;
ctx->last_dts = pkt->dts;
return 0;
}
@ -1551,6 +1559,12 @@ static int output_ready(AVCodecContext *avctx, int flush)
NvencContext *ctx = avctx->priv_data;
int nb_ready, nb_pending;
/* when B-frames are enabled, we wait for two initial timestamps to
* calculate the first dts */
if (!flush && avctx->max_b_frames > 0 &&
(ctx->initial_pts[0] == AV_NOPTS_VALUE || ctx->initial_pts[1] == AV_NOPTS_VALUE))
return 0;
nb_ready = av_fifo_size(ctx->output_surface_ready_queue) / sizeof(NvencSurface*);
nb_pending = av_fifo_size(ctx->output_surface_queue) / sizeof(NvencSurface*);
if (flush)
@ -1617,6 +1631,11 @@ int ff_nvenc_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
if (frame) {
av_fifo_generic_write(ctx->output_surface_queue, &inSurf, sizeof(inSurf), NULL);
timestamp_queue_enqueue(ctx->timestamp_list, frame->pts);
if (ctx->initial_pts[0] == AV_NOPTS_VALUE)
ctx->initial_pts[0] = frame->pts;
else if (ctx->initial_pts[1] == AV_NOPTS_VALUE)
ctx->initial_pts[1] = frame->pts;
}
/* all the pending buffers are now ready for output */

5
libavcodec/nvenc.h
View File

@ -157,7 +157,10 @@ typedef struct NvencContext
* AVCodecContext.pix_fmt when using hwaccel frames on input */
enum AVPixelFormat data_pix_fmt;
int64_t last_dts;
/* timestamps of the first two frames, for computing the first dts
* when B-frames are present */
int64_t initial_pts[2];
int first_packet_output;
void *nvencoder;