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avcodec/setts_bsf: add NEXT_PTS/DTS expression constants 

They correspond to the relevant fields from the packet that follows the
one where the expressions are being applied.

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2022-02-14 11:09:17 -03:00
parent d75e7a9a83
commit 9ed3139a76
3 changed files with 57 additions and 26 deletions
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6
doc/bitstream_filters.texi
View File

@ -777,6 +777,12 @@ The previous output DTS.
@item PREV_OUTPTS
The previous output PTS.
@item NEXT_DTS
The next input DTS.
@item NEXT_PTS
The next input PTS.
@item TB
The timebase of stream packet belongs.

75
libavcodec/setts_bsf.c
View File

@ -37,6 +37,8 @@ static const char *const var_names[] = {
"PREV_INDTS", ///< previous input DTS
"PREV_OUTPTS", ///< previous output PTS
"PREV_OUTDTS", ///< previous output DTS
"NEXT_PTS", ///< next input PTS
"NEXT_DTS", ///< next input DTS
"PTS", ///< original PTS in the file of the frame
"DTS", ///< original DTS in the file of the frame
"STARTPTS", ///< PTS at start of movie
@ -55,6 +57,8 @@ enum var_name {
VAR_PREV_INDTS,
VAR_PREV_OUTPTS,
VAR_PREV_OUTDTS,
VAR_NEXT_PTS,
VAR_NEXT_DTS,
VAR_PTS,
VAR_DTS,
VAR_STARTPTS,
@ -76,16 +80,16 @@ typedef struct SetTSContext {
int64_t start_pts;
int64_t start_dts;
int64_t prev_inpts;
int64_t prev_indts;
int64_t prev_outpts;
int64_t prev_outdts;
double var_values[VAR_VARS_NB];
AVExpr *ts_expr;
AVExpr *pts_expr;
AVExpr *dts_expr;
AVPacket *prev_inpkt;
AVPacket *prev_outpkt;
AVPacket *cur_pkt;
} SetTSContext;
static int setts_init(AVBSFContext *ctx)
@ -93,6 +97,12 @@ static int setts_init(AVBSFContext *ctx)
SetTSContext *s = ctx->priv_data;
int ret;
s->prev_inpkt = av_packet_alloc();
s->prev_outpkt = av_packet_alloc();
s->cur_pkt = av_packet_alloc();
if (!s->prev_inpkt || !s->prev_outpkt || !s->cur_pkt)
return AVERROR(ENOMEM);
if ((ret = av_expr_parse(&s->ts_expr, s->ts_str,
var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
av_log(ctx, AV_LOG_ERROR, "Error while parsing ts expression '%s'\n", s->ts_str);
@ -118,10 +128,6 @@ static int setts_init(AVBSFContext *ctx)
s->frame_number= 0;
s->start_pts = AV_NOPTS_VALUE;
s->start_dts = AV_NOPTS_VALUE;
s->prev_inpts = AV_NOPTS_VALUE;
s->prev_indts = AV_NOPTS_VALUE;
s->prev_outpts = AV_NOPTS_VALUE;
s->prev_outdts = AV_NOPTS_VALUE;
s->var_values[VAR_NOPTS] = AV_NOPTS_VALUE;
return 0;
@ -134,24 +140,31 @@ static int setts_filter(AVBSFContext *ctx, AVPacket *pkt)
int ret;
ret = ff_bsf_get_packet_ref(ctx, pkt);
if (ret < 0)
if (ret < 0 && (ret != AVERROR_EOF || !s->cur_pkt->data))
return ret;
if (!s->cur_pkt->data) {
av_packet_move_ref(s->cur_pkt, pkt);
return AVERROR(EAGAIN);
}
if (s->start_pts == AV_NOPTS_VALUE)
s->start_pts = pkt->pts;
s->start_pts = s->cur_pkt->pts;
if (s->start_dts == AV_NOPTS_VALUE)
s->start_dts = pkt->dts;
s->start_dts = s->cur_pkt->dts;
s->var_values[VAR_N] = s->frame_number++;
s->var_values[VAR_TS] = pkt->dts;
s->var_values[VAR_POS] = pkt->pos;
s->var_values[VAR_PTS] = pkt->pts;
s->var_values[VAR_DTS] = pkt->dts;
s->var_values[VAR_PREV_INPTS] = s->prev_inpts;
s->var_values[VAR_PREV_INDTS] = s->prev_indts;
s->var_values[VAR_PREV_OUTPTS] = s->prev_outpts;
s->var_values[VAR_PREV_OUTDTS] = s->prev_outdts;
s->var_values[VAR_TS] = s->cur_pkt->dts;
s->var_values[VAR_POS] = s->cur_pkt->pos;
s->var_values[VAR_PTS] = s->cur_pkt->pts;
s->var_values[VAR_DTS] = s->cur_pkt->dts;
s->var_values[VAR_PREV_INPTS] = s->prev_inpkt->pts;
s->var_values[VAR_PREV_INDTS] = s->prev_inpkt->dts;
s->var_values[VAR_PREV_OUTPTS] = s->prev_outpkt->pts;
s->var_values[VAR_PREV_OUTDTS] = s->prev_outpkt->dts;
s->var_values[VAR_NEXT_PTS] = pkt->pts;
s->var_values[VAR_NEXT_DTS] = pkt->dts;
s->var_values[VAR_STARTPTS] = s->start_pts;
s->var_values[VAR_STARTDTS] = s->start_dts;
s->var_values[VAR_TB] = ctx->time_base_out.den ? av_q2d(ctx->time_base_out) : 0;
@ -160,27 +173,35 @@ static int setts_filter(AVBSFContext *ctx, AVPacket *pkt)
new_ts = llrint(av_expr_eval(s->ts_expr, s->var_values, NULL));
if (s->pts_str) {
s->var_values[VAR_TS] = pkt->pts;
s->var_values[VAR_TS] = s->cur_pkt->pts;
new_pts = llrint(av_expr_eval(s->pts_expr, s->var_values, NULL));
} else {
new_pts = new_ts;
}
if (s->dts_str) {
s->var_values[VAR_TS] = pkt->dts;
s->var_values[VAR_TS] = s->cur_pkt->dts;
new_dts = llrint(av_expr_eval(s->dts_expr, s->var_values, NULL));
} else {
new_dts = new_ts;
}
s->prev_inpts = pkt->pts;
s->prev_indts = pkt->dts;
s->prev_outpts = new_pts;
s->prev_outdts = new_dts;
av_packet_unref(s->prev_inpkt);
av_packet_unref(s->prev_outpkt);
av_packet_move_ref(s->prev_inpkt, s->cur_pkt);
av_packet_move_ref(s->cur_pkt, pkt);
ret = av_packet_ref(pkt, s->prev_inpkt);
if (ret < 0)
return ret;
pkt->pts = new_pts;
pkt->dts = new_dts;
ret = av_packet_ref(s->prev_outpkt, pkt);
if (ret < 0)
av_packet_unref(pkt);
return ret;
}
@ -188,6 +209,10 @@ static void setts_close(AVBSFContext *bsf)
{
SetTSContext *s = bsf->priv_data;
av_packet_free(&s->prev_inpkt);
av_packet_free(&s->prev_outpkt);
av_packet_free(&s->cur_pkt);
av_expr_free(s->ts_expr);
s->ts_expr = NULL;
av_expr_free(s->pts_expr);

2
libavcodec/version.h
View File

@ -29,7 +29,7 @@
#define LIBAVCODEC_VERSION_MAJOR 59
#define LIBAVCODEC_VERSION_MINOR 21
#define LIBAVCODEC_VERSION_MICRO 100
#define LIBAVCODEC_VERSION_MICRO 101
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
LIBAVCODEC_VERSION_MINOR, \