return 0;
}
-static int gif_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
- AVPacket *avpkt)
+static int gif_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
{
- const uint8_t *buf = avpkt->data;
- int buf_size = avpkt->size;
GifState *s = avctx->priv_data;
- AVFrame *picture = data;
int ret;
- s->bytestream = buf;
- s->bytestream_end = buf + buf_size;
- if ((ret = gif_read_header1(s)) < 0)
- return ret;
+ bytestream2_init(&s->gb, avpkt->data, avpkt->size);
- avctx->pix_fmt = AV_PIX_FMT_PAL8;
+ s->frame->pts = avpkt->pts;
+ s->frame->pkt_pts = avpkt->pts;
+ s->frame->pkt_dts = avpkt->dts;
+ av_frame_set_pkt_duration(s->frame, avpkt->duration);
- if ((ret = ff_set_dimensions(avctx, s->screen_width, s->screen_height)) < 0)
- return ret;
+ if (avpkt->size >= 6) {
+ s->keyframe = memcmp(avpkt->data, gif87a_sig, 6) == 0 ||
+ memcmp(avpkt->data, gif89a_sig, 6) == 0;
+ } else {
+ s->keyframe = 0;
+ }
- if ((ret = ff_get_buffer(avctx, picture, 0)) < 0) {
- av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
- return ret;
+ if (s->keyframe) {
+ s->keyframe_ok = 0;
+ s->gce_prev_disposal = GCE_DISPOSAL_NONE;
+ if ((ret = gif_read_header1(s)) < 0)
+ return ret;
+
- if ((ret = av_image_check_size(s->screen_width, s->screen_height, 0, avctx)) < 0)
++ if ((ret = ff_set_dimensions(avctx, s->screen_width, s->screen_height)) < 0)
+ return ret;
- avcodec_set_dimensions(avctx, s->screen_width, s->screen_height);
+
+ av_frame_unref(s->frame);
+ if ((ret = ff_get_buffer(avctx, s->frame, 0)) < 0)
+ return ret;
+
+ av_fast_malloc(&s->idx_line, &s->idx_line_size, s->screen_width);
+ if (!s->idx_line)
+ return AVERROR(ENOMEM);
+
+ s->frame->pict_type = AV_PICTURE_TYPE_I;
+ s->frame->key_frame = 1;
+ s->keyframe_ok = 1;
+ } else {
+ if (!s->keyframe_ok) {
+ av_log(avctx, AV_LOG_ERROR, "cannot decode frame without keyframe\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
+ return ret;
+
+ s->frame->pict_type = AV_PICTURE_TYPE_P;
+ s->frame->key_frame = 0;
}
- s->image_palette = (uint32_t *)picture->data[1];
- ret = gif_parse_next_image(s, picture);
+
+ ret = gif_parse_next_image(s, s->frame);
if (ret < 0)
return ret;