| Message ID | 84c88034-b1db-6ccd-7f92-507c251c7368@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | [FFmpeg-devel] avformat/img2dec: Option to play sequence backwards | expand |
| Context | Check | Description |
|---|---|---|
| andriy/configure_x86 | warning | Failed to apply patch |
| andriy/configure_ppc | warning | Failed to apply patch |
| andriy/configure_aarch64_jetson | warning | Failed to apply patch |
| andriy/configure_armv7_RPi4 | warning | Failed to apply patch |
| yinshiyou/configure_loongarch64 | warning | Failed to apply patch |
diff --git a/libavformat/img2.h b/libavformat/img2.h index 5fd8ff77fc..3d01c00537 100644 --- a/libavformat/img2.h +++ b/libavformat/img2.h @@ -59,6 +59,7 @@ typedef struct VideoDemuxData { #endif int start_number; int start_number_range; + int reverse; int frame_size; int ts_from_file; int export_path_metadata; /**< enabled when set to 1. */ diff --git a/libavformat/img2dec.c b/libavformat/img2dec.c index 8608252d83..7b85e01aca 100644 --- a/libavformat/img2dec.c +++ b/libavformat/img2dec.c @@ -105,10 +105,12 @@ static int is_glob(const char *path) * @param plast_index pointer to index updated with the last number in the range * @param path path which has to be matched by the image files in the range * @param start_index minimum accepted value for the first index in the range + * @param start_index_range range for looking at the first sequence number + * @param reverse play backwards * @return -1 if no image file could be found */ static int find_image_range(AVIOContext *pb, int *pfirst_index, int *plast_index,
This patch should allow to play an image sequence in backwards direction, without needing to apply a reverse filter. ffmpeg -i sequence%05d.png forward.mkv ffmpeg -reverse 1 -i sequence%05d.png backward.mkv Signed-off-by: Sergio Acereda <sergio.acereda@gmail.com> --- libavformat/img2.h | 1 + libavformat/img2dec.c | 34 ++++++++++++++++++++++++---------- 2 files changed, 25 insertions(+), 10 deletions(-) - const char *path, int start_index, int start_index_range) + const char *path, int start_index, int start_index_range, int reverse) { char buf[1024]; int range, last_index, range1, first_index; @@ -152,8 +154,13 @@ static int find_image_range(AVIOContext *pb, int *pfirst_index, int *plast_index break; last_index += range; } - *pfirst_index = first_index; - *plast_index = last_index; + if (reverse) { + *pfirst_index = last_index; + *plast_index = first_index; + } else { + *pfirst_index = first_index; + *plast_index = last_index; + } return 0; fail: @@ -274,7 +281,7 @@ int ff_img_read_header(AVFormatContext *s1) } if ((s->pattern_type == PT_GLOB_SEQUENCE && !s->use_glob) || s->pattern_type == PT_SEQUENCE) { if (find_image_range(s1->pb, &first_index, &last_index, s->path, - s->start_number, s->start_number_range) < 0) { + s->start_number, s->start_number_range, s->reverse) < 0) { av_log(s1, AV_LOG_ERROR, "Could find no file with path '%s' and index in the range %d-%d\n", s->path, s->start_number, s->start_number + s->start_number_range - 1); @@ -307,7 +314,7 @@ int ff_img_read_header(AVFormatContext *s1) /* compute duration */ if (!s->ts_from_file) { st->start_time = 0; - st->duration = last_index - first_index + 1; + st->duration = abs(last_index - first_index) + 1; } } @@ -413,11 +420,12 @@ int ff_img_read_packet(AVFormatContext *s1, AVPacket *pkt) AVCodecParameters *par = s1->streams[0]->codecpar; if (!s->is_pipe) { + int bad = s->reverse? (s->img_number < s->img_last) : (s->img_number > s->img_last); /* loop over input */ - if (s->loop && s->img_number > s->img_last) { + if (s->loop && bad) { s->img_number = s->img_first; } - if (s->img_number > s->img_last) + if (bad) return AVERROR_EOF; if (s->pattern_type == PT_NONE) { av_strlcpy(filename_bytes, s->path, sizeof(filename_bytes)); @@ -554,8 +562,9 @@ int ff_img_read_packet(AVFormatContext *s1, AVPacket *pkt) } goto fail; } else { + int step = s->reverse? -1 : 1; s->img_count++; - s->img_number++; + s->img_number += step; s->pts++; return 0; } @@ -594,9 +603,13 @@ static int img_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp return 0; } - if (timestamp < 0 || !s1->loop && timestamp > s1->img_last - s1->img_first) + int bad = s1->reverse? (timestamp < s1->img_last) : (timestamp > s1->img_last); + if (timestamp < 0 || !s1->loop && bad) return -1; - s1->img_number = timestamp%(s1->img_last - s1->img_first + 1) + s1->img_first; + int dir = s1->reverse? -1 : 1; + int span = 1 + dir * (s1->img_last - s1->img_first); + int rel = timestamp % span; + s1->img_number = s1->img_first + dir * rel; s1->pts = timestamp; return 0; } @@ -619,6 +632,7 @@ const AVOption ff_img_options[] = { { "none", "disable pattern matching", 0, AV_OPT_TYPE_CONST, {.i64=PT_NONE }, INT_MIN, INT_MAX, DEC, "pattern_type" }, { "start_number", "set first number in the sequence", OFFSET(start_number), AV_OPT_TYPE_INT, {.i64 = 0 }, INT_MIN, INT_MAX, DEC }, { "start_number_range", "set range for looking at the first sequence number", OFFSET(start_number_range), AV_OPT_TYPE_INT, {.i64 = 5}, 1, INT_MAX, DEC }, + { "reverse", "reverse direction", OFFSET(reverse), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, DEC }, { "ts_from_file", "set frame timestamp from file's one", OFFSET(ts_from_file), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 2, DEC, "ts_type" }, { "none", "none", 0, AV_OPT_TYPE_CONST, {.i64 = 0 }, 0, 2, DEC, "ts_type" }, { "sec", "second precision", 0, AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 2, DEC, "ts_type" },