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Code Issues Releases Activity

avcodec/pngdec: split frame decoding in its own function.

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Benoit Fouet 2014-11-14 10:17:39 +01:00 committed by Michael Niedermayer
parent 8cab24df07
commit 00df32f6a9
1 changed files with 49 additions and 39 deletions
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88
libavcodec/pngdec.c
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@ -786,44 +786,12 @@ static void handle_small_bpp(PNGDecContext *s, AVFrame *p)
}
}
static int decode_frame_png(AVCodecContext *avctx,
void *data, int *got_frame,
AVPacket *avpkt)
static int decode_frame_common(AVCodecContext *avctx, PNGDecContext *s,
AVFrame *p, AVPacket *avpkt)
{
PNGDecContext *const s = avctx->priv_data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
AVFrame *p;
AVDictionary *metadata = NULL;
uint32_t tag, length;
int64_t sig;
int ret;
ff_thread_release_buffer(avctx, &s->last_picture);
FFSWAP(ThreadFrame, s->picture, s->last_picture);
p = s->picture.f;
bytestream2_init(&s->gb, buf, buf_size);
/* check signature */
sig = bytestream2_get_be64(&s->gb);
if (sig != PNGSIG &&
sig != MNGSIG) {
av_log(avctx, AV_LOG_ERROR, "Missing png signature\n");
return AVERROR_INVALIDDATA;
}
s->y = s->state = 0;
/* init the zlib */
s->zstream.zalloc = ff_png_zalloc;
s->zstream.zfree = ff_png_zfree;
s->zstream.opaque = NULL;
ret = inflateInit(&s->zstream);
if (ret != Z_OK) {
av_log(avctx, AV_LOG_ERROR, "inflateInit returned error %d\n", ret);
return AVERROR_EXTERNAL;
}
for (;;) {
if (bytestream2_get_bytes_left(&s->gb) <= 0) {
av_log(avctx, AV_LOG_ERROR, "%d bytes left\n", bytestream2_get_bytes_left(&s->gb));
@ -921,6 +889,53 @@ exit_loop:
av_frame_set_metadata(p, metadata);
metadata = NULL;
return 0;
fail:
av_dict_free(&metadata);
ff_thread_report_progress(&s->picture, INT_MAX, 0);
return AVERROR_INVALIDDATA;
}
static int decode_frame_png(AVCodecContext *avctx,
void *data, int *got_frame,
AVPacket *avpkt)
{
PNGDecContext *const s = avctx->priv_data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
AVFrame *p;
int64_t sig;
int ret;
ff_thread_release_buffer(avctx, &s->last_picture);
FFSWAP(ThreadFrame, s->picture, s->last_picture);
p = s->picture.f;
bytestream2_init(&s->gb, buf, buf_size);
/* check signature */
sig = bytestream2_get_be64(&s->gb);
if (sig != PNGSIG &&
sig != MNGSIG) {
av_log(avctx, AV_LOG_ERROR, "Missing png signature\n");
return AVERROR_INVALIDDATA;
}
s->y = s->state = 0;
/* init the zlib */
s->zstream.zalloc = ff_png_zalloc;
s->zstream.zfree = ff_png_zfree;
s->zstream.opaque = NULL;
ret = inflateInit(&s->zstream);
if (ret != Z_OK) {
av_log(avctx, AV_LOG_ERROR, "inflateInit returned error %d\n", ret);
return AVERROR_EXTERNAL;
}
if ((ret = decode_frame_common(avctx, s, p, avpkt)) < 0)
goto the_end;
if ((ret = av_frame_ref(data, s->picture.f)) < 0)
return ret;
@ -932,11 +947,6 @@ the_end:
inflateEnd(&s->zstream);
s->crow_buf = NULL;
return ret;
fail:
av_dict_free(&metadata);
ff_thread_report_progress(&s->picture, INT_MAX, 0);
ret = AVERROR_INVALIDDATA;
goto the_end;
}
static int update_thread_context(AVCodecContext *dst, const AVCodecContext *src)