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lavf: generic code for exporting attached pictures.

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This commit is contained in:
Anton Khirnov 2012-02-25 18:05:55 +01:00
parent a93b09cb45
commit dd2a4bcfd7
2 changed files with 44 additions and 18 deletions
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16
libavformat/avformat.h
View File

@ -530,6 +530,13 @@ typedef struct AVIndexEntry {
#define AV_DISPOSITION_HEARING_IMPAIRED 0x0080 /**< stream for hearing impaired audiences */
#define AV_DISPOSITION_VISUAL_IMPAIRED 0x0100 /**< stream for visual impaired audiences */
#define AV_DISPOSITION_CLEAN_EFFECTS 0x0200 /**< stream without voice */
/**
* The stream is stored in the file as an attached picture/"cover art" (e.g.
* APIC frame in ID3v2). The single packet associated with it will be returned
* among the first few packets read from the file unless seeking takes place.
* It can also be accessed at any time in AVStream.attached_pic.
*/
#define AV_DISPOSITION_ATTACHED_PIC 0x0400
/**
* Stream structure.
@ -602,6 +609,15 @@ typedef struct AVStream {
*/
AVRational avg_frame_rate;
/**
* For streams with AV_DISPOSITION_ATTACHED_PIC disposition, this packet
* will contain the attached picture.
*
* decoding: set by libavformat, must not be modified by the caller.
* encoding: unused
*/
AVPacket attached_pic;
/*****************************************************************
* All fields below this line are not part of the public API. They
* may not be used outside of libavformat and can be changed and

46
libavformat/utils.c
View File

@ -498,10 +498,27 @@ static int init_input(AVFormatContext *s, const char *filename, AVDictionary **o
return av_probe_input_buffer(s->pb, &s->iformat, filename, s, 0, 0);
}
static AVPacket *add_to_pktbuf(AVPacketList **packet_buffer, AVPacket *pkt,
AVPacketList **plast_pktl){
AVPacketList *pktl = av_mallocz(sizeof(AVPacketList));
if (!pktl)
return NULL;
if (*packet_buffer)
(*plast_pktl)->next = pktl;
else
*packet_buffer = pktl;
/* add the packet in the buffered packet list */
*plast_pktl = pktl;
pktl->pkt= *pkt;
return &pktl->pkt;
}
int avformat_open_input(AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options)
{
AVFormatContext *s = *ps;
int ret = 0;
int i, ret = 0;
AVDictionary *tmp = NULL;
if (!s && !(s = avformat_alloc_context()))
@ -551,6 +568,14 @@ int avformat_open_input(AVFormatContext **ps, const char *filename, AVInputForma
if ((ret = s->iformat->read_header(s)) < 0)
goto fail;
/* queue attached pictures */
for (i = 0; i < s->nb_streams; i++)
if (s->streams[i]->disposition & AV_DISPOSITION_ATTACHED_PIC) {
AVPacket copy = s->streams[i]->attached_pic;
copy.destruct = NULL;
add_to_pktbuf(&s->raw_packet_buffer, &copy, &s->raw_packet_buffer_end);
}
if (s->pb && !s->data_offset)
s->data_offset = avio_tell(s->pb);
@ -574,23 +599,6 @@ fail:
/*******************************************************/
static AVPacket *add_to_pktbuf(AVPacketList **packet_buffer, AVPacket *pkt,
AVPacketList **plast_pktl){
AVPacketList *pktl = av_mallocz(sizeof(AVPacketList));
if (!pktl)
return NULL;
if (*packet_buffer)
(*plast_pktl)->next = pktl;
else
*packet_buffer = pktl;
/* add the packet in the buffered packet list */
*plast_pktl = pktl;
pktl->pkt= *pkt;
return &pktl->pkt;
}
int av_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int ret, i;
@ -2547,6 +2555,8 @@ void avformat_free_context(AVFormatContext *s)
av_parser_close(st->parser);
av_free_packet(&st->cur_pkt);
}
if (st->attached_pic.data)
av_free_packet(&st->attached_pic);
av_dict_free(&st->metadata);
av_free(st->index_entries);
av_free(st->codec->extradata);