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fftools/ffmpeg: parse forced keyframes in of_open()

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Allows to remove the ugly of_get_chapters() wrapper.
This commit is contained in:
Anton Khirnov 2022-11-17 14:22:58 +01:00
parent efe4423627
commit 334e52e094
4 changed files with 106 additions and 99 deletions
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89
fftools/ffmpeg.c
View File

@ -113,15 +113,6 @@ const int program_birth_year = 2000;
static FILE *vstats_file;
const char *const forced_keyframes_const_names[] = {
"n",
"n_forced",
"prev_forced_n",
"prev_forced_t",
"t",
NULL
};
typedef struct BenchmarkTimeStamps {
int64_t real_usec;
int64_t user_usec;
@ -2590,11 +2581,6 @@ static int init_input_stream(InputStream *ist, char *error, int error_len)
return 0;
}
static int compare_int64(const void *a, const void *b)
{
return FFDIFFSIGN(*(const int64_t *)a, *(const int64_t *)b);
}
static int init_output_stream_streamcopy(OutputStream *ost)
{
OutputFile *of = output_files[ost->file_index];
@ -2748,61 +2734,6 @@ static void set_encoder_id(OutputFile *of, OutputStream *ost)
AV_DICT_DONT_STRDUP_VAL | AV_DICT_DONT_OVERWRITE);
}
static void parse_forced_key_frames(KeyframeForceCtx *kf, OutputFile *of)
{
const char *p;
int n = 1, i, size, index = 0;
int64_t t, *pts;
for (p = kf->forced_keyframes; *p; p++)
if (*p == ',')
n++;
size = n;
pts = av_malloc_array(size, sizeof(*pts));
if (!pts)
report_and_exit(AVERROR(ENOMEM));
p = kf->forced_keyframes;
for (i = 0; i < n; i++) {
char *next = strchr(p, ',');
if (next)
*next++ = 0;
if (!memcmp(p, "chapters", 8)) {
AVChapter * const *ch;
unsigned int nb_ch;
int j;
ch = of_get_chapters(of, &nb_ch);
if (nb_ch > INT_MAX - size ||
!(pts = av_realloc_f(pts, size += nb_ch - 1,
sizeof(*pts))))
report_and_exit(AVERROR(ENOMEM));
t = p[8] ? parse_time_or_die("force_key_frames", p + 8, 1) : 0;
for (j = 0; j < nb_ch; j++) {
const AVChapter *c = ch[j];
av_assert1(index < size);
pts[index++] = av_rescale_q(c->start, c->time_base,
AV_TIME_BASE_Q) + t;
}
} else {
av_assert1(index < size);
pts[index++] = parse_time_or_die("force_key_frames", p, 1);
}
p = next;
}
av_assert0(index == size);
qsort(pts, size, sizeof(*pts), compare_int64);
kf->nb_pts = size;
kf->pts = pts;
}
static void init_encoder_time_base(OutputStream *ost, AVRational default_time_base)
{
InputStream *ist = ost->ist;
@ -2949,26 +2880,6 @@ static int init_output_stream_encode(OutputStream *ost, AVFrame *frame)
enc_ctx->field_order = AV_FIELD_TT;
}
if (ost->kf.forced_keyframes) {
if (!strncmp(ost->kf.forced_keyframes, "expr:", 5)) {
ret = av_expr_parse(&ost->kf.pexpr, ost->kf.forced_keyframes+5,
forced_keyframes_const_names, NULL, NULL, NULL, NULL, 0, NULL);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR,
"Invalid force_key_frames expression '%s'\n", ost->kf.forced_keyframes+5);
return ret;
}
ost->kf.expr_const_values[FKF_N] = 0;
ost->kf.expr_const_values[FKF_N_FORCED] = 0;
ost->kf.expr_const_values[FKF_PREV_FORCED_N] = NAN;
ost->kf.expr_const_values[FKF_PREV_FORCED_T] = NAN;
// Don't parse the 'forced_keyframes' in case of 'keep-source-keyframes',
// parse it only for static kf timings
} else if(strncmp(ost->kf.forced_keyframes, "source", 6)) {
parse_forced_key_frames(&ost->kf, of);
}
}
break;
case AVMEDIA_TYPE_SUBTITLE:
enc_ctx->time_base = AV_TIME_BASE_Q;

2
fftools/ffmpeg.h
View File

@ -757,8 +757,6 @@ void of_close(OutputFile **pof);
*/
void of_output_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int eof);
int64_t of_filesize(OutputFile *of);
AVChapter * const *
of_get_chapters(OutputFile *of, unsigned int *nb_chapters);
int ifile_open(const OptionsContext *o, const char *filename);
void ifile_close(InputFile **f);

8
fftools/ffmpeg_mux.c
View File

@ -736,11 +736,3 @@ int64_t of_filesize(OutputFile *of)
Muxer *mux = mux_from_of(of);
return atomic_load(&mux->last_filesize);
}
AVChapter * const *
of_get_chapters(OutputFile *of, unsigned int *nb_chapters)
{
Muxer *mux = mux_from_of(of);
*nb_chapters = mux->fc->nb_chapters;
return mux->fc->chapters;
}

106
fftools/ffmpeg_mux_init.c
View File

@ -1745,6 +1745,104 @@ finish:
return ret;
}
const char *const forced_keyframes_const_names[] = {
"n",
"n_forced",
"prev_forced_n",
"prev_forced_t",
"t",
NULL
};
static int compare_int64(const void *a, const void *b)
{
return FFDIFFSIGN(*(const int64_t *)a, *(const int64_t *)b);
}
static void parse_forced_key_frames(KeyframeForceCtx *kf, const Muxer *mux)
{
const char *p;
int n = 1, i, size, index = 0;
int64_t t, *pts;
for (p = kf->forced_keyframes; *p; p++)
if (*p == ',')
n++;
size = n;
pts = av_malloc_array(size, sizeof(*pts));
if (!pts)
report_and_exit(AVERROR(ENOMEM));
p = kf->forced_keyframes;
for (i = 0; i < n; i++) {
char *next = strchr(p, ',');
if (next)
*next++ = 0;
if (!memcmp(p, "chapters", 8)) {
AVChapter * const *ch = mux->fc->chapters;
unsigned int nb_ch = mux->fc->nb_chapters;
int j;
if (nb_ch > INT_MAX - size ||
!(pts = av_realloc_f(pts, size += nb_ch - 1,
sizeof(*pts))))
report_and_exit(AVERROR(ENOMEM));
t = p[8] ? parse_time_or_die("force_key_frames", p + 8, 1) : 0;
for (j = 0; j < nb_ch; j++) {
const AVChapter *c = ch[j];
av_assert1(index < size);
pts[index++] = av_rescale_q(c->start, c->time_base,
AV_TIME_BASE_Q) + t;
}
} else {
av_assert1(index < size);
pts[index++] = parse_time_or_die("force_key_frames", p, 1);
}
p = next;
}
av_assert0(index == size);
qsort(pts, size, sizeof(*pts), compare_int64);
kf->nb_pts = size;
kf->pts = pts;
}
static int process_forced_keyframes(Muxer *mux)
{
for (int i = 0; i < mux->of.nb_streams; i++) {
OutputStream *ost = mux->of.streams[i];
if (!ost->kf.forced_keyframes)
continue;
if (!strncmp(ost->kf.forced_keyframes, "expr:", 5)) {
int ret = av_expr_parse(&ost->kf.pexpr, ost->kf.forced_keyframes+5,
forced_keyframes_const_names, NULL, NULL, NULL, NULL, 0, NULL);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR,
"Invalid force_key_frames expression '%s'\n", ost->kf.forced_keyframes+5);
return ret;
}
ost->kf.expr_const_values[FKF_N] = 0;
ost->kf.expr_const_values[FKF_N_FORCED] = 0;
ost->kf.expr_const_values[FKF_PREV_FORCED_N] = NAN;
ost->kf.expr_const_values[FKF_PREV_FORCED_T] = NAN;
// Don't parse the 'forced_keyframes' in case of 'keep-source-keyframes',
// parse it only for static kf timings
} else if (strncmp(ost->kf.forced_keyframes, "source", 6)) {
parse_forced_key_frames(&ost->kf, mux);
}
}
return 0;
}
static void validate_enc_avopt(const Muxer *mux, const AVDictionary *codec_avopt)
{
const AVClass *class = avcodec_get_class();
@ -1961,6 +2059,14 @@ int of_open(const OptionsContext *o, const char *filename)
exit_program(1);
}
// parse forced keyframe specifications;
// must be done after chapters are created
err = process_forced_keyframes(mux);
if (err < 0) {
av_log(NULL, AV_LOG_FATAL, "Error processing forced keyframes\n");
exit_program(1);
}
err = setup_sync_queues(mux, oc, o->shortest_buf_duration * AV_TIME_BASE);
if (err < 0) {
av_log(NULL, AV_LOG_FATAL, "Error setting up output sync queues\n");