static int mp_decode_frame(AVCodecContext *avctx,
void *data, int *got_frame,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
MotionPixelsContext *mp = avctx->priv_data;
GetBitContext gb;
int i, count1, count2, sz, ret;
if ((ret = ff_reget_buffer(avctx, mp->frame)) < 0)
return ret;
/* le32 bitstream msb first */
av_fast_padded_malloc(&mp->bswapbuf, &mp->bswapbuf_size, buf_size);
if (!mp->bswapbuf)
return AVERROR(ENOMEM);
mp->dsp.bswap_buf((uint32_t *)mp->bswapbuf, (const uint32_t *)buf, buf_size / 4);
if (buf_size & 3)
memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3);
init_get_bits(&gb, mp->bswapbuf, buf_size * 8);
memset(mp->changes_map, 0, avctx->width * avctx->height);
for (i = !(avctx->extradata[1] & 2); i < 2; ++i) {
count1 = get_bits(&gb, 12);
count2 = get_bits(&gb, 12);
mp_read_changes_map(mp, &gb, count1, 8, i);
mp_read_changes_map(mp, &gb, count2, 4, i);
}
mp->codes_count = get_bits(&gb, 4);
if (mp->codes_count == 0)
goto end;
if (mp->changes_map[0] == 0) {
*(uint16_t *)mp->frame->data[0] = get_bits(&gb, 15);
mp->changes_map[0] = 1;
}
if (mp_read_codes_table(mp, &gb) < 0)
goto end;
sz = get_bits(&gb, 18);
if (avctx->extradata[0] != 5)
sz += get_bits(&gb, 18);
if (sz == 0)
goto end;
if (mp->max_codes_bits <= 0)
goto end;
if (init_vlc(&mp->vlc, mp->max_codes_bits, mp->codes_count, &mp->codes[0].size, sizeof(HuffCode), 1, &mp->codes[0].code, sizeof(HuffCode), 4, 0))
goto end;
mp_decode_frame_helper(mp, &gb);
ff_free_vlc(&mp->vlc);
end:
if ((ret = av_frame_ref(data, mp->frame)) < 0)
return ret;
*got_frame = 1;
return buf_size;
}
static int mp_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
MotionPixelsContext *mp = avctx->priv_data;
GetBitContext gb;
int i, count1, count2, sz;
mp->frame.reference = 1;
mp->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
if (avctx->reget_buffer(avctx, &mp->frame)) {
av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
return -1;
}
/* le32 bitstream msb first */
av_fast_malloc(&mp->bswapbuf, &mp->bswapbuf_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!mp->bswapbuf)
return AVERROR(ENOMEM);
mp->dsp.bswap_buf((uint32_t *)mp->bswapbuf, (const uint32_t *)buf, buf_size / 4);
if (buf_size & 3)
memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3);
init_get_bits(&gb, mp->bswapbuf, buf_size * 8);
memset(mp->changes_map, 0, avctx->width * avctx->height);
for (i = !(avctx->extradata[1] & 2); i < 2; ++i) {
count1 = get_bits(&gb, 12);
count2 = get_bits(&gb, 12);
mp_read_changes_map(mp, &gb, count1, 8, i);
mp_read_changes_map(mp, &gb, count2, 4, i);
}
mp->codes_count = get_bits(&gb, 4);
if (mp->codes_count == 0)
goto end;
if (mp->changes_map[0] == 0) {
*(uint16_t *)mp->frame.data[0] = get_bits(&gb, 15);
mp->changes_map[0] = 1;
}
mp_read_codes_table(mp, &gb);
sz = get_bits(&gb, 18);
if (avctx->extradata[0] != 5)
sz += get_bits(&gb, 18);
if (sz == 0)
goto end;
init_vlc(&mp->vlc, mp->max_codes_bits, mp->codes_count, &mp->codes[0].size, sizeof(HuffCode), 1, &mp->codes[0].code, sizeof(HuffCode), 4, 0);
mp_decode_frame_helper(mp, &gb);
free_vlc(&mp->vlc);
end:
*data_size = sizeof(AVFrame);
*(AVFrame *)data = mp->frame;
return buf_size;
}