static int mss1_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
MSS1Context *ctx = avctx->priv_data;
MSS12Context *c = &ctx->ctx;
GetBitContext gb;
ArithCoder acoder;
int pal_changed = 0;
int ret;
init_get_bits(&gb, buf, buf_size * 8);
arith_init(&acoder, &gb);
ctx->pic.reference = 3;
ctx->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE |
FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
if ((ret = avctx->reget_buffer(avctx, &ctx->pic)) < 0) {
av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
return ret;
}
c->pal_pic = ctx->pic.data[0] + ctx->pic.linesize[0] * (avctx->height - 1);
c->pal_stride = -ctx->pic.linesize[0];
c->keyframe = !arith_get_bit(&acoder);
if (c->keyframe) {
c->corrupted = 0;
ff_mss12_slicecontext_reset(&ctx->sc);
pal_changed = decode_pal(c, &acoder);
ctx->pic.key_frame = 1;
ctx->pic.pict_type = AV_PICTURE_TYPE_I;
} else {
if (c->corrupted)
return AVERROR_INVALIDDATA;
ctx->pic.key_frame = 0;
ctx->pic.pict_type = AV_PICTURE_TYPE_P;
}
c->corrupted = ff_mss12_decode_rect(&ctx->sc, &acoder, 0, 0,
avctx->width, avctx->height);
if (c->corrupted)
return AVERROR_INVALIDDATA;
memcpy(ctx->pic.data[1], c->pal, AVPALETTE_SIZE);
ctx->pic.palette_has_changed = pal_changed;
*got_frame = 1;
*(AVFrame*)data = ctx->pic;
/* always report that the buffer was completely consumed */
return buf_size;
}
static int mss1_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
AVPacket *avpkt)
{
MSS1Context *ctx = avctx->priv_data;
MSS12Context *c = &ctx->ctx;
GetBitContext gb;
ArithCoder acoder;
int pal_changed = 0;
int ret;
if ((ret = init_get_bits8(&gb, avpkt->data, avpkt->size)) < 0)
return ret;
arith_init(&acoder, &gb);
if ((ret = ff_reget_buffer(avctx, ctx->pic)) < 0)
return ret;
c->pal_pic = ctx->pic->data[0] + ctx->pic->linesize[0] * (avctx->height - 1);
c->pal_stride = -ctx->pic->linesize[0];
c->keyframe = !arith_get_bit(&acoder);
if (c->keyframe) {
c->corrupted = 0;
ff_mss12_slicecontext_reset(&ctx->sc);
pal_changed = decode_pal(c, &acoder);
ctx->pic->key_frame = 1;
ctx->pic->pict_type = AV_PICTURE_TYPE_I;
} else {
if (c->corrupted)
return AVERROR_INVALIDDATA;
ctx->pic->key_frame = 0;
ctx->pic->pict_type = AV_PICTURE_TYPE_P;
}
c->corrupted = ff_mss12_decode_rect(&ctx->sc, &acoder, 0, 0,
avctx->width, avctx->height);
if (c->corrupted)
return AVERROR_INVALIDDATA;
memcpy(ctx->pic->data[1], c->pal, AVPALETTE_SIZE);
ctx->pic->palette_has_changed = pal_changed;
if ((ret = av_frame_ref(data, ctx->pic)) < 0)
return ret;
*got_frame = 1;
/* always report that the buffer was completely consumed */
return avpkt->size;
}