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#ifndef DEBUG
#define DEBUG 1
#endif
#include "video_decode.h"
#include <libavutil/avutil.h>
#include <libavformat/avformat.h>
#include <libavcodec/avcodec.h>
#include <libswscale/swscale.h>
struct video_decode {
AVFormatContext *fmt_ctx;
AVCodecContext *codec_ctx;
AVCodec *codec;
int stream;
};
struct video_frame_priv {
struct video_frame base;
AVFrame *frame;
};
int
video_decode_init(struct video_decode **vd_out, char *file, int64_t ts)
{
struct video_decode *vd;
vd = calloc(1, sizeof *vd);
if (vd == NULL)
return -1;
av_register_all();
vd->fmt_ctx = NULL;
vd->codec_ctx = NULL;
if (avformat_open_input(&vd->fmt_ctx, file, NULL, NULL) != 0)
return -1;
if (avformat_find_stream_info(vd->fmt_ctx, NULL) < 0)
return -2;
#if DEBUG
av_dump_format(vd->fmt_ctx, 0, file, 0);
#endif
vd->stream = av_find_best_stream(vd->fmt_ctx, AVMEDIA_TYPE_VIDEO,
-1, -1, NULL, 0);
if (vd->stream == -1)
return -3;
vd->codec_ctx = vd->fmt_ctx->streams[vd->stream]->codec;
if (vd->fmt_ctx->start_time != AV_NOPTS_VALUE)
ts += vd->fmt_ctx->start_time;
/* FIXME: Check size */
avformat_seek_file(vd->fmt_ctx, vd->stream, INT64_MIN, ts, INT64_MAX,0);
vd->codec = avcodec_find_decoder(vd->codec_ctx->codec_id);
if (vd->codec == NULL) {
fprintf(stderr, "Failed to find decoder!\n");
return -4;
}
#if DEBUG
printf("has cap truncated: %d\n",
vd->codec->capabilities & CODEC_CAP_TRUNCATED);
#endif
#if 0
if (codec->capabilities & CODEC_CAP_TRUNCATED)
codec_ctx->flags |= CODEC_FLAG_TRUNCATED;
#endif
if (avcodec_open2(vd->codec_ctx, vd->codec, NULL) < 0) {
fprintf(stderr, "Failed to open codec!\n");
return -5;
}
*vd_out = vd;
return 0;
}
void
video_decode_uninit(struct video_decode **_vd)
{
struct video_decode *vd = *_vd;
*_vd = NULL;
avcodec_close(vd->codec_ctx);
#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(53, 17, 0)
avformat_close_input(&vd->fmt_ctx);
#else
av_close_input_file(vd->fmt_ctx);
#endif
free(vd);
}
int
video_decode_get_frame(struct video_decode *vd, struct video_frame **frame)
{
struct video_frame_priv *f;
AVPacket packet;
int decoded, got_picture;
f = calloc(1, sizeof *f);
if (f == NULL)
return -1;
packet.data = NULL;
do {
if (packet.data != NULL)
av_free_packet(&packet);
if (av_read_frame(vd->fmt_ctx, &packet) < 0) {
#if DEBUG
fprintf(stderr, "Found no video stream packet!\n");
#endif
return -1;
}
} while (packet.stream_index != vd->stream);
f->frame = avcodec_alloc_frame();
do {
#if DEBUG
printf("packet.data: %p, packet.siz: %d, packet.strm_idx: %d\n",
packet.data, packet.size, packet.stream_index);
#endif
decoded = avcodec_decode_video2(vd->codec_ctx, f->frame,
&got_picture, &packet);
if (decoded < 0) {
fprintf(stderr, "Error while decoding frame!\n");
return -2;
}
#if DEBUG
printf("bytes_decoded: %d, got_picture: %d\n",
decoded, got_picture);
#endif
} while (got_picture == 0 && packet.size > 0);
av_free_packet(&packet);
if (got_picture == 0)
return -3;
f->base.data = f->frame->data[0];
f->base.width = vd->codec_ctx->width;
f->base.height = vd->codec_ctx->height;
f->base.stride = f->frame->linesize[0];
*frame = &f->base;
return 0;
}
void
video_decode_free_frame(struct video_frame **frame)
{
struct video_frame_priv *f = (struct video_frame_priv *) *frame;
*frame = NULL;
av_free(f->frame);
free(f);
}
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