[FFmpeg-devel] [PATCH v14 01/14] global: Prepare AVFrame for subtitle handling
Soft Works
softworkz at hotmail.com
Thu Oct 21 06:19:05 EEST 2021
Root commit for adding subtitle filtering capabilities.
In detail:
- Add type (AVMediaType) field to AVFrame
Replaces previous way of distinction which was based on checking
width and height to determine whether a frame is audio or video
- Add subtitle fields to AVFrame
- Add new struct AVSubtitleArea, similar to AVSubtitleRect, but different
allocation logic. Cannot and must not be used interchangeably, hence
the new struct
- Move enum AVSubtitleType, AVSubtitle and AVSubtitleRect to avutil
- Add public-named members to enum AVSubtitleType (AV_SUBTITLE_FMT_)
- Add avcodec_decode_subtitle3 which takes subtitle frames,
serving as compatibility shim to legacy subtitle decoding
- Add additional methods for conversion between old and new API
Signed-off-by: softworkz <softworkz at hotmail.com>
---
libavcodec/avcodec.c | 19 ---
libavcodec/avcodec.h | 75 ++----------
libavcodec/decode.c | 53 ++++++--
libavcodec/pgssubdec.c | 1 +
libavcodec/utils.c | 11 ++
libavfilter/vf_subtitles.c | 50 ++++++--
libavformat/utils.c | 1 +
libavutil/Makefile | 2 +
libavutil/frame.c | 194 ++++++++++++++++++++++++++----
libavutil/frame.h | 93 +++++++++++++-
libavutil/subfmt.c | 240 +++++++++++++++++++++++++++++++++++++
libavutil/subfmt.h | 185 ++++++++++++++++++++++++++++
12 files changed, 799 insertions(+), 125 deletions(-)
create mode 100644 libavutil/subfmt.c
create mode 100644 libavutil/subfmt.h
diff --git a/libavcodec/avcodec.c b/libavcodec/avcodec.c
index ff3d73e237..52ce345d49 100644
--- a/libavcodec/avcodec.c
+++ b/libavcodec/avcodec.c
@@ -422,25 +422,6 @@ void avcodec_flush_buffers(AVCodecContext *avctx)
av_bsf_flush(avci->bsf);
}
-void avsubtitle_free(AVSubtitle *sub)
-{
- int i;
-
- for (i = 0; i < sub->num_rects; i++) {
- av_freep(&sub->rects[i]->data[0]);
- av_freep(&sub->rects[i]->data[1]);
- av_freep(&sub->rects[i]->data[2]);
- av_freep(&sub->rects[i]->data[3]);
- av_freep(&sub->rects[i]->text);
- av_freep(&sub->rects[i]->ass);
- av_freep(&sub->rects[i]);
- }
-
- av_freep(&sub->rects);
-
- memset(sub, 0, sizeof(*sub));
-}
-
av_cold int avcodec_close(AVCodecContext *avctx)
{
int i;
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 7ee8bc2b7c..0c5819b116 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -35,6 +35,7 @@
#include "libavutil/frame.h"
#include "libavutil/log.h"
#include "libavutil/pixfmt.h"
+#include "libavutil/subfmt.h"
#include "libavutil/rational.h"
#include "codec.h"
@@ -1674,7 +1675,7 @@ typedef struct AVCodecContext {
/**
* Header containing style information for text subtitles.
- * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
+ * For AV_SUBTITLE_FMT_ASS subtitle type, it should contain the whole ASS
* [Script Info] and [V4+ Styles] section, plus the [Events] line and
* the Format line following. It shouldn't include any Dialogue line.
* - encoding: Set/allocated/freed by user (before avcodec_open2())
@@ -2238,63 +2239,8 @@ typedef struct AVHWAccel {
* @}
*/
-enum AVSubtitleType {
- SUBTITLE_NONE,
-
- SUBTITLE_BITMAP, ///< A bitmap, pict will be set
-
- /**
- * Plain text, the text field must be set by the decoder and is
- * authoritative. ass and pict fields may contain approximations.
- */
- SUBTITLE_TEXT,
-
- /**
- * Formatted text, the ass field must be set by the decoder and is
- * authoritative. pict and text fields may contain approximations.
- */
- SUBTITLE_ASS,
-};
-
#define AV_SUBTITLE_FLAG_FORCED 0x00000001
-typedef struct AVSubtitleRect {
- int x; ///< top left corner of pict, undefined when pict is not set
- int y; ///< top left corner of pict, undefined when pict is not set
- int w; ///< width of pict, undefined when pict is not set
- int h; ///< height of pict, undefined when pict is not set
- int nb_colors; ///< number of colors in pict, undefined when pict is not set
-
- /**
- * data+linesize for the bitmap of this subtitle.
- * Can be set for text/ass as well once they are rendered.
- */
- uint8_t *data[4];
- int linesize[4];
-
- enum AVSubtitleType type;
-
- char *text; ///< 0 terminated plain UTF-8 text
-
- /**
- * 0 terminated ASS/SSA compatible event line.
- * The presentation of this is unaffected by the other values in this
- * struct.
- */
- char *ass;
-
- int flags;
-} AVSubtitleRect;
-
-typedef struct AVSubtitle {
- uint16_t format; /* 0 = graphics */
- uint32_t start_display_time; /* relative to packet pts, in ms */
- uint32_t end_display_time; /* relative to packet pts, in ms */
- unsigned num_rects;
- AVSubtitleRect **rects;
- int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
-} AVSubtitle;
-
/**
* Return the LIBAVCODEC_VERSION_INT constant.
*/
@@ -2430,13 +2376,6 @@ int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **op
*/
int avcodec_close(AVCodecContext *avctx);
-/**
- * Free all allocated data in the given subtitle struct.
- *
- * @param sub AVSubtitle to free.
- */
-void avsubtitle_free(AVSubtitle *sub);
-
/**
* @}
*/
@@ -2527,6 +2466,8 @@ enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
* must be freed with avsubtitle_free if *got_sub_ptr is set.
* @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
* @param[in] avpkt The input AVPacket containing the input buffer.
+ *
+ * @deprecated Use the new decode API (avcodec_send_packet, avcodec_receive_frame) instead.
*/
int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
int *got_sub_ptr,
@@ -3125,6 +3066,14 @@ void avcodec_flush_buffers(AVCodecContext *avctx);
*/
int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
+/**
+ * Return subtitle format from a codec descriptor
+ *
+ * @param codec_descriptor codec descriptor
+ * @return the subtitle type (e.g. bitmap, text)
+ */
+enum AVSubtitleType av_get_subtitle_format_from_codecdesc(const AVCodecDescriptor *codec_descriptor);
+
/* memory */
/**
diff --git a/libavcodec/decode.c b/libavcodec/decode.c
index 294c040716..b2495f8578 100644
--- a/libavcodec/decode.c
+++ b/libavcodec/decode.c
@@ -577,6 +577,34 @@ static int decode_receive_frame_internal(AVCodecContext *avctx, AVFrame *frame)
return ret;
}
+static int decode_subtitle2_priv(AVCodecContext *avctx, AVSubtitle *sub,
+ int *got_sub_ptr, const AVPacket *avpkt);
+
+static int decode_subtitle_shim(AVCodecContext *avctx, AVFrame *frame, const AVPacket *avpkt)
+{
+ int ret, got_sub_ptr = 0;
+ AVSubtitle subtitle = { 0 };
+
+ av_frame_unref(frame);
+
+ ret = decode_subtitle2_priv(avctx, &subtitle, &got_sub_ptr, avpkt);
+
+ if (ret >= 0 && got_sub_ptr) {
+ frame->type = AVMEDIA_TYPE_SUBTITLE;
+ frame->format = subtitle.format;
+ ret = av_frame_get_buffer2(frame, 0);
+ if (ret < 0)
+ return ret;
+ av_frame_put_subtitle(frame, &subtitle);
+
+ frame->pkt_dts = avpkt->dts;
+ }
+
+ avsubtitle_free(&subtitle);
+
+ return ret;
+}
+
int attribute_align_arg avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt)
{
AVCodecInternal *avci = avctx->internal;
@@ -591,6 +619,9 @@ int attribute_align_arg avcodec_send_packet(AVCodecContext *avctx, const AVPacke
if (avpkt && !avpkt->size && avpkt->data)
return AVERROR(EINVAL);
+ if (avctx->codec_type == AVMEDIA_TYPE_SUBTITLE)
+ return decode_subtitle_shim(avctx, avci->buffer_frame, avpkt);
+
av_packet_unref(avci->buffer_pkt);
if (avpkt && (avpkt->data || avpkt->side_data_elems)) {
ret = av_packet_ref(avci->buffer_pkt, avpkt);
@@ -652,7 +683,9 @@ int attribute_align_arg avcodec_receive_frame(AVCodecContext *avctx, AVFrame *fr
if (avci->buffer_frame->buf[0]) {
av_frame_move_ref(frame, avci->buffer_frame);
- } else {
+ } else if (avctx->codec_type == AVMEDIA_TYPE_SUBTITLE)
+ return AVERROR(EAGAIN);
+ else {
ret = decode_receive_frame_internal(avctx, frame);
if (ret < 0)
return ret;
@@ -724,7 +757,7 @@ static void get_subtitle_defaults(AVSubtitle *sub)
#define UTF8_MAX_BYTES 4 /* 5 and 6 bytes sequences should not be used */
static int recode_subtitle(AVCodecContext *avctx, AVPacket **outpkt,
- AVPacket *inpkt, AVPacket *buf_pkt)
+ const AVPacket *inpkt, AVPacket *buf_pkt)
{
#if CONFIG_ICONV
iconv_t cd = (iconv_t)-1;
@@ -803,9 +836,8 @@ static int utf8_check(const uint8_t *str)
return 1;
}
-int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
- int *got_sub_ptr,
- AVPacket *avpkt)
+static int decode_subtitle2_priv(AVCodecContext *avctx, AVSubtitle *sub,
+ int *got_sub_ptr, const AVPacket *avpkt)
{
int ret = 0;
@@ -845,10 +877,7 @@ int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
avctx->pkt_timebase, ms);
}
- if (avctx->codec_descriptor->props & AV_CODEC_PROP_BITMAP_SUB)
- sub->format = 0;
- else if (avctx->codec_descriptor->props & AV_CODEC_PROP_TEXT_SUB)
- sub->format = 1;
+ sub->format = av_get_subtitle_format_from_codecdesc(avctx->codec_descriptor);
for (unsigned i = 0; i < sub->num_rects; i++) {
if (avctx->sub_charenc_mode != FF_SUB_CHARENC_MODE_IGNORE &&
@@ -872,6 +901,12 @@ int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
return ret;
}
+int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
+ int *got_sub_ptr, AVPacket *avpkt)
+{
+ return decode_subtitle2_priv(avctx, sub, got_sub_ptr, avpkt);
+}
+
enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *avctx,
const enum AVPixelFormat *fmt)
{
diff --git a/libavcodec/pgssubdec.c b/libavcodec/pgssubdec.c
index 388639a110..5709058b1c 100644
--- a/libavcodec/pgssubdec.c
+++ b/libavcodec/pgssubdec.c
@@ -32,6 +32,7 @@
#include "libavutil/colorspace.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
+#include "libavutil/subfmt.h"
#define RGBA(r,g,b,a) (((unsigned)(a) << 24) | ((r) << 16) | ((g) << 8) | (b))
#define MAX_EPOCH_PALETTES 8 // Max 8 allowed per PGS epoch
diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index a91a54b0dc..efe14e5a43 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -824,6 +824,17 @@ int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes)
return FFMAX(0, duration);
}
+enum AVSubtitleType av_get_subtitle_format_from_codecdesc(const AVCodecDescriptor *codec_descriptor)
+{
+ if(codec_descriptor->props & AV_CODEC_PROP_BITMAP_SUB)
+ return AV_SUBTITLE_FMT_BITMAP;
+
+ if(codec_descriptor->props & AV_CODEC_PROP_TEXT_SUB)
+ return AV_SUBTITLE_FMT_ASS;
+
+ return AV_SUBTITLE_FMT_UNKNOWN;
+}
+
int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes)
{
int duration = get_audio_frame_duration(par->codec_id, par->sample_rate,
diff --git a/libavfilter/vf_subtitles.c b/libavfilter/vf_subtitles.c
index 377160c72b..6b54cf669b 100644
--- a/libavfilter/vf_subtitles.c
+++ b/libavfilter/vf_subtitles.c
@@ -35,14 +35,12 @@
# include "libavformat/avformat.h"
#endif
#include "libavutil/avstring.h"
-#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "drawutils.h"
#include "avfilter.h"
#include "internal.h"
#include "formats.h"
-#include "video.h"
typedef struct AssContext {
const AVClass *class;
@@ -292,6 +290,29 @@ static int attachment_is_font(AVStream * st)
return 0;
}
+static int decode(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *pkt)
+{
+ int ret;
+
+ *got_frame = 0;
+
+ if (pkt) {
+ ret = avcodec_send_packet(avctx, pkt);
+ // In particular, we don't expect AVERROR(EAGAIN), because we read all
+ // decoded frames with avcodec_receive_frame() until done.
+ if (ret < 0 && ret != AVERROR_EOF)
+ return ret;
+ }
+
+ ret = avcodec_receive_frame(avctx, frame);
+ if (ret < 0 && ret != AVERROR(EAGAIN))
+ return ret;
+ if (ret >= 0)
+ *got_frame = 1;
+
+ return 0;
+}
+
AVFILTER_DEFINE_CLASS(subtitles);
static av_cold int init_subtitles(AVFilterContext *ctx)
@@ -306,6 +327,7 @@ static av_cold int init_subtitles(AVFilterContext *ctx)
AVStream *st;
AVPacket pkt;
AssContext *ass = ctx->priv;
+ enum AVSubtitleType subtitle_format;
/* Init libass */
ret = init(ctx);
@@ -386,13 +408,17 @@ static av_cold int init_subtitles(AVFilterContext *ctx)
ret = AVERROR_DECODER_NOT_FOUND;
goto end;
}
+
dec_desc = avcodec_descriptor_get(st->codecpar->codec_id);
- if (dec_desc && !(dec_desc->props & AV_CODEC_PROP_TEXT_SUB)) {
+ subtitle_format = av_get_subtitle_format_from_codecdesc(dec_desc);
+
+ if (subtitle_format != AV_SUBTITLE_FMT_ASS) {
av_log(ctx, AV_LOG_ERROR,
- "Only text based subtitles are currently supported\n");
- ret = AVERROR_PATCHWELCOME;
+ "Only text based subtitles are supported by this filter\n");
+ ret = AVERROR_INVALIDDATA;
goto end;
}
+
if (ass->charenc)
av_dict_set(&codec_opts, "sub_charenc", ass->charenc, 0);
@@ -448,18 +474,18 @@ static av_cold int init_subtitles(AVFilterContext *ctx)
dec_ctx->subtitle_header_size);
while (av_read_frame(fmt, &pkt) >= 0) {
int i, got_subtitle;
- AVSubtitle sub = {0};
+ AVFrame *sub = av_frame_alloc();
if (pkt.stream_index == sid) {
- ret = avcodec_decode_subtitle2(dec_ctx, &sub, &got_subtitle, &pkt);
+ ret = decode(dec_ctx, sub, &got_subtitle, &pkt);
if (ret < 0) {
av_log(ctx, AV_LOG_WARNING, "Error decoding: %s (ignored)\n",
av_err2str(ret));
} else if (got_subtitle) {
- const int64_t start_time = av_rescale_q(sub.pts, AV_TIME_BASE_Q, av_make_q(1, 1000));
- const int64_t duration = sub.end_display_time;
- for (i = 0; i < sub.num_rects; i++) {
- char *ass_line = sub.rects[i]->ass;
+ const int64_t start_time = av_rescale_q(sub->subtitle_pts, AV_TIME_BASE_Q, av_make_q(1, 1000));
+ const int64_t duration = sub->subtitle_end_time;
+ for (i = 0; i < sub->num_subtitle_areas; i++) {
+ char *ass_line = sub->subtitle_areas[i]->ass;
if (!ass_line)
break;
ass_process_chunk(ass->track, ass_line, strlen(ass_line),
@@ -468,7 +494,7 @@ static av_cold int init_subtitles(AVFilterContext *ctx)
}
}
av_packet_unref(&pkt);
- avsubtitle_free(&sub);
+ av_frame_free(&sub);
}
end:
diff --git a/libavformat/utils.c b/libavformat/utils.c
index 509c0ecdce..f1ec4c4c2f 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -31,6 +31,7 @@
#include "libavutil/opt.h"
#include "libavutil/parseutils.h"
#include "libavutil/pixfmt.h"
+#include "libavutil/subfmt.h"
#include "libavutil/thread.h"
#include "libavutil/time.h"
diff --git a/libavutil/Makefile b/libavutil/Makefile
index 410ac636f7..04e1101bf3 100644
--- a/libavutil/Makefile
+++ b/libavutil/Makefile
@@ -74,6 +74,7 @@ HEADERS = adler32.h \
sha512.h \
spherical.h \
stereo3d.h \
+ subfmt.h \
threadmessage.h \
time.h \
timecode.h \
@@ -159,6 +160,7 @@ OBJS = adler32.o \
slicethread.o \
spherical.o \
stereo3d.o \
+ subfmt.o \
threadmessage.o \
time.o \
timecode.o \
diff --git a/libavutil/frame.c b/libavutil/frame.c
index 2617cda2b5..733a6d2b7d 100644
--- a/libavutil/frame.c
+++ b/libavutil/frame.c
@@ -26,6 +26,7 @@
#include "imgutils.h"
#include "mem.h"
#include "samplefmt.h"
+#include "subfmt.h"
#include "hwcontext.h"
#define CHECK_CHANNELS_CONSISTENCY(frame) \
@@ -50,6 +51,9 @@ const char *av_get_colorspace_name(enum AVColorSpace val)
return name[val];
}
#endif
+
+static int frame_copy_subtitles(AVFrame *dst, const AVFrame *src, int copy_data);
+
static void get_frame_defaults(AVFrame *frame)
{
if (frame->extended_data != frame->data)
@@ -72,7 +76,12 @@ static void get_frame_defaults(AVFrame *frame)
frame->colorspace = AVCOL_SPC_UNSPECIFIED;
frame->color_range = AVCOL_RANGE_UNSPECIFIED;
frame->chroma_location = AVCHROMA_LOC_UNSPECIFIED;
- frame->flags = 0;
+ frame->subtitle_start_time = 0;
+ frame->subtitle_end_time = 0;
+ frame->num_subtitle_areas = 0;
+ frame->subtitle_areas = NULL;
+ frame->subtitle_pts = 0;
+ frame->subtitle_header = NULL;
}
static void free_side_data(AVFrameSideData **ptr_sd)
@@ -243,23 +252,55 @@ static int get_audio_buffer(AVFrame *frame, int align)
}
+static int get_subtitle_buffer(AVFrame *frame)
+{
+ // Buffers in AVFrame->buf[] are not used in case of subtitle frames.
+ // To accomodate with existing code, checking ->buf[0] to determine
+ // whether a frame is ref-counted or has data, we're adding a 1-byte
+ // buffer here, which marks the subtitle frame to contain data.
+ frame->buf[0] = av_buffer_alloc(1);
+ if (!frame->buf[0]) {
+ av_frame_unref(frame);
+ return AVERROR(ENOMEM);
+ }
+
+ frame->extended_data = frame->data;
+
+ return 0;
+}
+
int av_frame_get_buffer(AVFrame *frame, int align)
+{
+ if (frame->width > 0 && frame->height > 0)
+ frame->type = AVMEDIA_TYPE_VIDEO;
+ else if (frame->nb_samples > 0 && (frame->channel_layout || frame->channels > 0))
+ frame->type = AVMEDIA_TYPE_AUDIO;
+
+ return av_frame_get_buffer2(frame, align);
+}
+
+int av_frame_get_buffer2(AVFrame *frame, int align)
{
if (frame->format < 0)
return AVERROR(EINVAL);
- if (frame->width > 0 && frame->height > 0)
+ switch(frame->type) {
+ case AVMEDIA_TYPE_VIDEO:
return get_video_buffer(frame, align);
- else if (frame->nb_samples > 0 && (frame->channel_layout || frame->channels > 0))
+ case AVMEDIA_TYPE_AUDIO:
return get_audio_buffer(frame, align);
-
- return AVERROR(EINVAL);
+ case AVMEDIA_TYPE_SUBTITLE:
+ return get_subtitle_buffer(frame);
+ default:
+ return AVERROR(EINVAL);
+ }
}
static int frame_copy_props(AVFrame *dst, const AVFrame *src, int force_copy)
{
int ret, i;
+ dst->type = src->type;
dst->key_frame = src->key_frame;
dst->pict_type = src->pict_type;
dst->sample_aspect_ratio = src->sample_aspect_ratio;
@@ -290,6 +331,12 @@ static int frame_copy_props(AVFrame *dst, const AVFrame *src, int force_copy)
dst->colorspace = src->colorspace;
dst->color_range = src->color_range;
dst->chroma_location = src->chroma_location;
+ dst->subtitle_start_time = src->subtitle_start_time;
+ dst->subtitle_end_time = src->subtitle_end_time;
+ dst->subtitle_pts = src->subtitle_pts;
+
+ if ((ret = av_buffer_replace(&dst->subtitle_header, src->subtitle_header)) < 0)
+ return ret;
av_dict_copy(&dst->metadata, src->metadata, 0);
@@ -331,6 +378,7 @@ int av_frame_ref(AVFrame *dst, const AVFrame *src)
av_assert1(dst->width == 0 && dst->height == 0);
av_assert1(dst->channels == 0);
+ dst->type = src->type;
dst->format = src->format;
dst->width = src->width;
dst->height = src->height;
@@ -344,7 +392,7 @@ int av_frame_ref(AVFrame *dst, const AVFrame *src)
/* duplicate the frame data if it's not refcounted */
if (!src->buf[0]) {
- ret = av_frame_get_buffer(dst, 0);
+ ret = av_frame_get_buffer2(dst, 0);
if (ret < 0)
goto fail;
@@ -366,6 +414,10 @@ int av_frame_ref(AVFrame *dst, const AVFrame *src)
}
}
+ /* copy subtitle areas */
+ if (src->type == AVMEDIA_TYPE_SUBTITLE)
+ frame_copy_subtitles(dst, src, 0);
+
if (src->extended_buf) {
dst->extended_buf = av_calloc(src->nb_extended_buf,
sizeof(*dst->extended_buf));
@@ -436,7 +488,7 @@ AVFrame *av_frame_clone(const AVFrame *src)
void av_frame_unref(AVFrame *frame)
{
- int i;
+ unsigned i, n;
if (!frame)
return;
@@ -455,6 +507,21 @@ void av_frame_unref(AVFrame *frame)
av_buffer_unref(&frame->opaque_ref);
av_buffer_unref(&frame->private_ref);
+ av_buffer_unref(&frame->subtitle_header);
+
+ for (i = 0; i < frame->num_subtitle_areas; i++) {
+ AVSubtitleArea *area = frame->subtitle_areas[i];
+
+ for (n = 0; n < FF_ARRAY_ELEMS(area->buf); n++)
+ av_buffer_unref(&area->buf[n]);
+
+ av_freep(&area->text);
+ av_freep(&area->ass);
+ av_free(area);
+ }
+
+ av_freep(&frame->subtitle_areas);
+
get_frame_defaults(frame);
}
@@ -472,7 +539,8 @@ void av_frame_move_ref(AVFrame *dst, AVFrame *src)
int av_frame_is_writable(AVFrame *frame)
{
- int i, ret = 1;
+ AVSubtitleArea *area;
+ unsigned i, n, ret = 1;
/* assume non-refcounted frames are not writable */
if (!frame->buf[0])
@@ -484,6 +552,15 @@ int av_frame_is_writable(AVFrame *frame)
for (i = 0; i < frame->nb_extended_buf; i++)
ret &= !!av_buffer_is_writable(frame->extended_buf[i]);
+ for (i = 0; i < frame->num_subtitle_areas; i++) {
+ area = frame->subtitle_areas[i];
+ if (area) {
+ for (n = 0; n < FF_ARRAY_ELEMS(area->buf); n++)
+ if (area->buf[n])
+ ret &= !!av_buffer_is_writable(area->buf[n]);
+ }
+ }
+
return ret;
}
@@ -499,6 +576,7 @@ int av_frame_make_writable(AVFrame *frame)
return 0;
memset(&tmp, 0, sizeof(tmp));
+ tmp.type = frame->type;
tmp.format = frame->format;
tmp.width = frame->width;
tmp.height = frame->height;
@@ -509,7 +587,7 @@ int av_frame_make_writable(AVFrame *frame)
if (frame->hw_frames_ctx)
ret = av_hwframe_get_buffer(frame->hw_frames_ctx, &tmp, 0);
else
- ret = av_frame_get_buffer(&tmp, 0);
+ ret = av_frame_get_buffer2(&tmp, 0);
if (ret < 0)
return ret;
@@ -544,14 +622,22 @@ AVBufferRef *av_frame_get_plane_buffer(AVFrame *frame, int plane)
uint8_t *data;
int planes, i;
- if (frame->nb_samples) {
- int channels = frame->channels;
- if (!channels)
- return NULL;
- CHECK_CHANNELS_CONSISTENCY(frame);
- planes = av_sample_fmt_is_planar(frame->format) ? channels : 1;
- } else
+ switch(frame->type) {
+ case AVMEDIA_TYPE_VIDEO:
planes = 4;
+ break;
+ case AVMEDIA_TYPE_AUDIO:
+ {
+ int channels = frame->channels;
+ if (!channels)
+ return NULL;
+ CHECK_CHANNELS_CONSISTENCY(frame);
+ planes = av_sample_fmt_is_planar(frame->format) ? channels : 1;
+ break;
+ }
+ default:
+ return NULL;
+ }
if (plane < 0 || plane >= planes || !frame->extended_data[plane])
return NULL;
@@ -675,17 +761,39 @@ static int frame_copy_audio(AVFrame *dst, const AVFrame *src)
return 0;
}
+static int frame_copy_subtitles(AVFrame *dst, const AVFrame *src, int copy_data)
+{
+ dst->format = src->format;
+
+ dst->num_subtitle_areas = src->num_subtitle_areas;
+
+ if (src->num_subtitle_areas) {
+ dst->subtitle_areas = av_malloc_array(src->num_subtitle_areas, sizeof(AVSubtitleArea *));
+
+ for (unsigned i = 0; i < src->num_subtitle_areas; i++) {
+ dst->subtitle_areas[i] = av_mallocz(sizeof(AVSubtitleArea));
+ av_subtitle_area2area(dst->subtitle_areas[i], src->subtitle_areas[i], copy_data);
+ }
+ }
+
+ return 0;
+}
+
int av_frame_copy(AVFrame *dst, const AVFrame *src)
{
if (dst->format != src->format || dst->format < 0)
return AVERROR(EINVAL);
- if (dst->width > 0 && dst->height > 0)
+ switch(dst->type) {
+ case AVMEDIA_TYPE_VIDEO:
return frame_copy_video(dst, src);
- else if (dst->nb_samples > 0 && dst->channels > 0)
+ case AVMEDIA_TYPE_AUDIO:
return frame_copy_audio(dst, src);
-
- return AVERROR(EINVAL);
+ case AVMEDIA_TYPE_SUBTITLE:
+ return frame_copy_subtitles(dst, src, 1);
+ default:
+ return AVERROR(EINVAL);
+ }
}
void av_frame_remove_side_data(AVFrame *frame, enum AVFrameSideDataType type)
@@ -831,3 +939,49 @@ int av_frame_apply_cropping(AVFrame *frame, int flags)
return 0;
}
+
+/**
+ * Copies subtitle data from AVSubtitle (deprecated) to AVFrame
+ *
+ * @note This is a compatibility method for conversion to the legacy API
+ */
+void av_frame_put_subtitle(AVFrame *frame, AVSubtitle *sub)
+{
+ frame->format = sub->format;
+ frame->subtitle_start_time = sub->start_display_time;
+ frame->subtitle_end_time = sub->end_display_time;
+ frame->subtitle_pts = sub->pts;
+ frame->num_subtitle_areas = sub->num_rects;
+
+ if (sub->num_rects) {
+ frame->subtitle_areas = av_malloc_array(sub->num_rects, sizeof(AVSubtitleArea *));
+
+ for (unsigned i = 0; i < sub->num_rects; i++) {
+ frame->subtitle_areas[i] = av_mallocz(sizeof(AVSubtitleArea));
+ av_subtitle_rect2area(frame->subtitle_areas[i], sub->rects[i]);
+ }
+ }
+}
+
+/**
+ * Copies subtitle data from AVFrame to AVSubtitle (deprecated)
+ *
+ * @note This is a compatibility method for conversion to the legacy API
+ */
+void av_frame_get_subtitle(AVSubtitle *sub, AVFrame *frame)
+{
+ sub->start_display_time = frame->subtitle_start_time;
+ sub->end_display_time = frame->subtitle_end_time;
+ sub->pts = frame->subtitle_pts;
+ sub->num_rects = frame->num_subtitle_areas;
+
+ if (frame->num_subtitle_areas) {
+ sub->rects = av_malloc_array(frame->num_subtitle_areas, sizeof(AVSubtitle *));
+
+ for (unsigned i = 0; i < frame->num_subtitle_areas; i++) {
+ sub->rects[i] = av_mallocz(sizeof(AVSubtitleRect));
+ av_subtitle_area2rect(sub->rects[i], frame->subtitle_areas[i]);
+ }
+ }
+}
+
diff --git a/libavutil/frame.h b/libavutil/frame.h
index ff2540a20f..21122819b1 100644
--- a/libavutil/frame.h
+++ b/libavutil/frame.h
@@ -34,6 +34,7 @@
#include "rational.h"
#include "samplefmt.h"
#include "pixfmt.h"
+#include "subfmt.h"
#include "version.h"
@@ -271,7 +272,7 @@ typedef struct AVRegionOfInterest {
} AVRegionOfInterest;
/**
- * This structure describes decoded (raw) audio or video data.
+ * This structure describes decoded (raw) audio, video or subtitle data.
*
* AVFrame must be allocated using av_frame_alloc(). Note that this only
* allocates the AVFrame itself, the buffers for the data must be managed
@@ -302,6 +303,13 @@ typedef struct AVRegionOfInterest {
*/
typedef struct AVFrame {
#define AV_NUM_DATA_POINTERS 8
+ /**
+ * Media type of the frame (audio, video, subtitles..)
+ *
+ * See AVMEDIA_TYPE_xxx
+ */
+ enum AVMediaType type;
+
/**
* pointer to the picture/channel planes.
* This might be different from the first allocated byte
@@ -371,7 +379,7 @@ typedef struct AVFrame {
/**
* format of the frame, -1 if unknown or unset
* Values correspond to enum AVPixelFormat for video frames,
- * enum AVSampleFormat for audio)
+ * enum AVSampleFormat for audio, AVSubtitleType for subtitles)
*/
int format;
@@ -462,6 +470,39 @@ typedef struct AVFrame {
*/
uint64_t channel_layout;
+ /**
+ * Display start time, relative to packet pts, in ms.
+ */
+ uint32_t subtitle_start_time;
+
+ /**
+ * Display end time, relative to packet pts, in ms.
+ */
+ uint32_t subtitle_end_time;
+
+ /**
+ * Number of items in the @ref subtitle_areas array.
+ */
+ unsigned num_subtitle_areas;
+
+ /**
+ * Array of subtitle areas, may be empty.
+ */
+ AVSubtitleArea **subtitle_areas;
+
+ /**
+ * Usually the same as packet pts, in AV_TIME_BASE.
+ *
+ * @deprecated This is kept for compatibility reasons and corresponds to
+ * AVSubtitle->pts. Might be removed in the future.
+ */
+ int64_t subtitle_pts;
+
+ /**
+ * Header containing style information for text subtitles.
+ */
+ AVBufferRef *subtitle_header;
+
/**
* AVBuffer references backing the data for this frame. If all elements of
* this array are NULL, then this frame is not reference counted. This array
@@ -721,6 +762,8 @@ void av_frame_move_ref(AVFrame *dst, AVFrame *src);
/**
* Allocate new buffer(s) for audio or video data.
*
+ * Note: For subtitle data, use av_frame_get_buffer2
+ *
* The following fields must be set on frame before calling this function:
* - format (pixel format for video, sample format for audio)
* - width and height for video
@@ -740,9 +783,39 @@ void av_frame_move_ref(AVFrame *dst, AVFrame *src);
* recommended to pass 0 here unless you know what you are doing.
*
* @return 0 on success, a negative AVERROR on error.
+ *
+ * @deprecated Use @ref av_frame_get_buffer2 instead and set @ref AVFrame.type
+ * before calling.
*/
+attribute_deprecated
int av_frame_get_buffer(AVFrame *frame, int align);
+/**
+ * Allocate new buffer(s) for audio, video or subtitle data.
+ *
+ * The following fields must be set on frame before calling this function:
+ * - format (pixel format for video, sample format for audio)
+ * - width and height for video
+ * - nb_samples and channel_layout for audio
+ * - type (AVMediaType)
+ *
+ * This function will fill AVFrame.data and AVFrame.buf arrays and, if
+ * necessary, allocate and fill AVFrame.extended_data and AVFrame.extended_buf.
+ * For planar formats, one buffer will be allocated for each plane.
+ *
+ * @warning: if frame already has been allocated, calling this function will
+ * leak memory. In addition, undefined behavior can occur in certain
+ * cases.
+ *
+ * @param frame frame in which to store the new buffers.
+ * @param align Required buffer size alignment. If equal to 0, alignment will be
+ * chosen automatically for the current CPU. It is highly
+ * recommended to pass 0 here unless you know what you are doing.
+ *
+ * @return 0 on success, a negative AVERROR on error.
+ */
+int av_frame_get_buffer2(AVFrame *frame, int align);
+
/**
* Check if the frame data is writable.
*
@@ -844,6 +917,22 @@ AVFrameSideData *av_frame_get_side_data(const AVFrame *frame,
*/
void av_frame_remove_side_data(AVFrame *frame, enum AVFrameSideDataType type);
+/**
+ * Copies subtitle data from AVSubtitle to AVFrame.
+ *
+ * @deprecated This is a compatibility method for interoperability with
+ * the legacy subtitle API.
+ */
+void av_frame_put_subtitle(AVFrame *frame, AVSubtitle *sub);
+
+/**
+ * Copies subtitle data from AVFrame to AVSubtitle.
+ *
+ * @deprecated This is a compatibility method for interoperability with
+ * the legacy subtitle API.
+ */
+void av_frame_get_subtitle(AVSubtitle *sub, AVFrame *frame);
+
/**
* Flags for frame cropping.
diff --git a/libavutil/subfmt.c b/libavutil/subfmt.c
new file mode 100644
index 0000000000..24fbeffacd
--- /dev/null
+++ b/libavutil/subfmt.c
@@ -0,0 +1,240 @@
+/*
+ * Copyright (c) 2021 softworkz
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <string.h>
+#include "common.h"
+#include "subfmt.h"
+
+typedef struct SubtitleFmtInfo {
+ enum AVSubtitleType fmt;
+ const char* name;
+} SubtitleFmtInfo;
+
+static SubtitleFmtInfo sub_fmt_info[AV_SUBTITLE_FMT_NB] = {
+ {.fmt = AV_SUBTITLE_FMT_UNKNOWN, .name = "Unknown subtitle format", },
+ {.fmt = AV_SUBTITLE_FMT_BITMAP, .name = "Graphical subtitles", },
+ {.fmt = AV_SUBTITLE_FMT_TEXT, .name = "Text subtitles (plain)", },
+ {.fmt = AV_SUBTITLE_FMT_ASS, .name = "Text subtitles (ass)", },
+};
+
+const char *av_get_subtitle_fmt_name(enum AVSubtitleType sub_fmt)
+{
+ if (sub_fmt < 0 || sub_fmt >= AV_SUBTITLE_FMT_NB)
+ return NULL;
+ return sub_fmt_info[sub_fmt].name;
+}
+
+enum AVSubtitleType av_get_subtitle_fmt(const char *name)
+{
+ for (int i = 0; i < AV_SUBTITLE_FMT_NB; i++)
+ if (!strcmp(sub_fmt_info[i].name, name))
+ return i;
+ return AV_SUBTITLE_FMT_NONE;
+}
+
+int av_subtitle_area2rect(AVSubtitleRect *dst, const AVSubtitleArea *src)
+{
+ dst->x = src->x;
+ dst->y = src->y;
+ dst->w = src->w;
+ dst->h = src->h;
+ dst->nb_colors = src->nb_colors;
+ dst->type = src->type;
+
+ switch (dst->type) {
+ case AV_SUBTITLE_FMT_BITMAP:
+
+ if (src->h > 0 && src->w > 0 && src->buf[0]) {
+ uint32_t *pal;
+ AVBufferRef *buf = src->buf[0];
+ dst->data[0] = av_mallocz(buf->size);
+ memcpy(dst->data[0], buf->data, buf->size);
+ dst->linesize[0] = src->linesize[0];
+
+ dst->data[1] = av_mallocz(256 * 4);
+ pal = (uint32_t *)dst->data[1];
+
+ for (unsigned i = 0; i < 256; i++) {
+ pal[i] = src->pal[i];
+ }
+ }
+
+ break;
+ case AV_SUBTITLE_FMT_TEXT:
+
+ if (src->text)
+ dst->text = av_strdup(src->text);
+ else
+ dst->text = av_strdup("");
+
+ if (!dst->text)
+ return AVERROR(ENOMEM);
+
+ break;
+ case AV_SUBTITLE_FMT_ASS:
+
+ if (src->ass)
+ dst->ass = av_strdup(src->ass);
+ else
+ dst->ass = av_strdup("");
+
+ if (!dst->ass)
+ return AVERROR(ENOMEM);
+
+ break;
+ default:
+
+ av_log(NULL, AV_LOG_ERROR, "Subtitle rect has invalid format: %d", dst->type);
+ return AVERROR(ENOMEM);
+ }
+
+ return 0;
+}
+
+int av_subtitle_rect2area(AVSubtitleArea *dst, const AVSubtitleRect *src)
+{
+ dst->x = src->x;
+ dst->y = src->y;
+ dst->w = src->w;
+ dst->h = src->h;
+ dst->nb_colors = src->nb_colors;
+ dst->type = src->type;
+
+ switch (dst->type) {
+ case AV_SUBTITLE_FMT_BITMAP:
+
+ if (src->h > 0 && src->w > 0 && src->data[0]) {
+ AVBufferRef *buf = av_buffer_allocz(src->h * src->linesize[0]);
+ memcpy(buf->data, src->data[0], buf->size);
+
+ dst->buf[0] = buf;
+ dst->linesize[0] = src->linesize[0];
+ }
+
+ if (src->data[1]) {
+ uint32_t *pal = (uint32_t *)src->data[1];
+
+ for (unsigned i = 0; i < 256; i++) {
+ dst->pal[i] = pal[i];
+ }
+ }
+
+ break;
+ case AV_SUBTITLE_FMT_TEXT:
+
+ if (src->text) {
+ dst->text = av_strdup(src->text);
+ if (!dst->text)
+ return AVERROR(ENOMEM);
+ }
+
+ break;
+ case AV_SUBTITLE_FMT_ASS:
+
+ if (src->ass) {
+ dst->ass = av_strdup(src->ass);
+ if (!dst->ass)
+ return AVERROR(ENOMEM);
+ }
+
+ break;
+ default:
+
+ av_log(NULL, AV_LOG_ERROR, "Subtitle area has invalid format: %d", dst->type);
+ return AVERROR(ENOMEM);
+ }
+
+ return 0;
+}
+
+int av_subtitle_area2area(AVSubtitleArea *dst, const AVSubtitleArea *src, int copy_data)
+{
+ dst->x = src->x;
+ dst->y = src->y;
+ dst->w = src->w;
+ dst->h = src->h;
+ dst->nb_colors = src->nb_colors;
+ dst->type = src->type;
+
+ switch (dst->type) {
+ case AV_SUBTITLE_FMT_BITMAP:
+
+ if (src->h > 0 && src->w > 0 && src->buf[0]) {
+ dst->buf[0] = av_buffer_ref(src->buf[0]);
+ if (!dst->buf[0])
+ return AVERROR(ENOMEM);
+
+ if (copy_data) {
+ const int ret = av_buffer_make_writable(&dst->buf[0]);
+ if (ret < 0)
+ return ret;
+ }
+
+ dst->linesize[0] = src->linesize[0];
+ }
+
+ for (unsigned i = 0; i < 256; i++)
+ dst->pal[i] = src->pal[i];
+
+ break;
+ case AV_SUBTITLE_FMT_TEXT:
+
+ if (src->text) {
+ dst->text = av_strdup(src->text);
+ if (!dst->text)
+ return AVERROR(ENOMEM);
+ }
+
+ break;
+ case AV_SUBTITLE_FMT_ASS:
+
+ if (src->ass) {
+ dst->ass = av_strdup(src->ass);
+ if (!dst->ass)
+ return AVERROR(ENOMEM);
+ }
+
+ break;
+ default:
+
+ av_log(NULL, AV_LOG_ERROR, "Subtitle area has invalid format: %d", dst->type);
+ return AVERROR(ENOMEM);
+ }
+
+ return 0;
+}
+
+void avsubtitle_free(AVSubtitle *sub)
+{
+ for (unsigned i = 0; i < sub->num_rects; i++) {
+ av_freep(&sub->rects[i]->data[0]);
+ av_freep(&sub->rects[i]->data[1]);
+ av_freep(&sub->rects[i]->data[2]);
+ av_freep(&sub->rects[i]->data[3]);
+ av_freep(&sub->rects[i]->text);
+ av_freep(&sub->rects[i]->ass);
+ av_freep(&sub->rects[i]);
+ }
+
+ av_freep(&sub->rects);
+
+ memset(sub, 0, sizeof(*sub));
+}
+
diff --git a/libavutil/subfmt.h b/libavutil/subfmt.h
new file mode 100644
index 0000000000..372e3db413
--- /dev/null
+++ b/libavutil/subfmt.h
@@ -0,0 +1,185 @@
+/*
+ * Copyright (c) 2021 softworkz
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVUTIL_SUBFMT_H
+#define AVUTIL_SUBFMT_H
+
+#include <inttypes.h>
+
+#include "buffer.h"
+
+enum AVSubtitleType {
+
+ /**
+ * Subtitle format unknown.
+ */
+ AV_SUBTITLE_FMT_NONE = -1,
+
+ /**
+ * Subtitle format unknown.
+ */
+ AV_SUBTITLE_FMT_UNKNOWN = 0,
+
+ /**
+ * Bitmap area in AVSubtitleRect.data, pixfmt AV_PIX_FMT_PAL8.
+ */
+ AV_SUBTITLE_FMT_BITMAP = 1,
+ SUBTITLE_BITMAP = 1, ///< Deprecated, use AV_SUBTITLE_FMT_BITMAP instead.
+
+ /**
+ * Plain text in AVSubtitleRect.text.
+ */
+ AV_SUBTITLE_FMT_TEXT = 2,
+ SUBTITLE_TEXT = 2, ///< Deprecated, use AV_SUBTITLE_FMT_TEXT instead.
+
+ /**
+ * Text Formatted as per ASS specification, contained AVSubtitleRect.ass.
+ */
+ AV_SUBTITLE_FMT_ASS = 3,
+ SUBTITLE_ASS = 3, ///< Deprecated, use AV_SUBTITLE_FMT_ASS instead.
+
+ AV_SUBTITLE_FMT_NB,
+};
+
+typedef struct AVSubtitleArea {
+#define AV_NUM_BUFFER_POINTERS 1
+
+ enum AVSubtitleType type;
+ int flags;
+
+ int x; ///< top left corner of area.
+ int y; ///< top left corner of area.
+ int w; ///< width of area.
+ int h; ///< height of area.
+ int nb_colors; ///< number of colors in bitmap palette (@ref pal).
+
+ /**
+ * Buffers and line sizes for the bitmap of this subtitle.
+ *
+ * @{
+ */
+ AVBufferRef *buf[AV_NUM_BUFFER_POINTERS];
+ int linesize[AV_NUM_BUFFER_POINTERS];
+ /**
+ * @}
+ */
+
+ uint32_t pal[256]; ///< RGBA palette for the bitmap.
+
+ char *text; ///< 0-terminated plain UTF-8 text
+ char *ass; ///< 0-terminated ASS/SSA compatible event line.
+
+} AVSubtitleArea;
+
+typedef struct AVSubtitleRect {
+ unsigned nb_refs;
+ int x; ///< top left corner of pict, undefined when pict is not set
+ int y; ///< top left corner of pict, undefined when pict is not set
+ int w; ///< width of pict, undefined when pict is not set
+ int h; ///< height of pict, undefined when pict is not set
+ int nb_colors; ///< number of colors in pict, undefined when pict is not set
+
+ /**
+ * data+linesize for the bitmap of this subtitle.
+ */
+ uint8_t *data[4];
+ int linesize[4];
+
+ enum AVSubtitleType type;
+
+ char *text; ///< 0 terminated plain UTF-8 text
+
+ /**
+ * 0-terminated ASS/SSA compatible event line.
+ */
+ char *ass;
+
+ int flags;
+} AVSubtitleRect;
+
+typedef struct AVSubtitle {
+ uint16_t format; /* 0 = graphics */
+ uint32_t start_display_time; /* relative to packet pts, in ms */
+ uint32_t end_display_time; /* relative to packet pts, in ms */
+ unsigned num_rects;
+ AVSubtitleRect **rects;
+ int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
+} AVSubtitle;
+
+/**
+ * Return the name of sub_fmt, or NULL if sub_fmt is not
+ * recognized.
+ */
+const char *av_get_subtitle_fmt_name(enum AVSubtitleType sub_fmt);
+
+/**
+ * Return a subtitle format corresponding to name, or AV_SUBTITLE_FMT_NONE
+ * on error.
+ *
+ * @param name Subtitle format name.
+ */
+enum AVSubtitleType av_get_subtitle_fmt(const char *name);
+
+/**
+ * Copy a subtitle area.
+ *
+ * @param dst The target area.
+ * @param src The source area.
+ * @param copy_data Determines whether to copy references or actual
+ * data from @ref AVSubtitleArea.buf.
+ *
+ * @return 0 on success.
+ */
+int av_subtitle_area2area(AVSubtitleArea *dst, const AVSubtitleArea *src, int copy_data);
+
+/**
+ * Copy data from @ref AVSubtitleArea to @ref AVSubtitleRect.
+ *
+ * @param dst The target rect (@ref AVSubtitleRect).
+ * @param src The source area (@ref AVSubtitleArea).
+ *
+ * @return 0 on success.
+ *
+ * @deprecated This is a compatibility method for interoperability with
+ * the legacy subtitle API.
+ */
+int av_subtitle_area2rect(AVSubtitleRect *dst, const AVSubtitleArea *src);
+
+/**
+ * Copy data from @ref AVSubtitleRect to @ref AVSubtitleArea.
+ *
+ * @param dst The source area (@ref AVSubtitleArea).
+ * @param src The target rect (@ref AVSubtitleRect).
+ *
+ * @return 0 on success.
+ *
+ * @deprecated This is a compatibility method for interoperability with
+ * the legacy subtitle API.
+ */
+int av_subtitle_rect2area(AVSubtitleArea *dst, const AVSubtitleRect *src);
+
+/**
+ * Free all allocated data in the given subtitle struct.
+ *
+ * @param sub AVSubtitle to free.
+ */
+void avsubtitle_free(AVSubtitle *sub);
+
+#endif /* AVUTIL_SUBFMT_H */
--
2.30.2.windows.1
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