diff options
Diffstat (limited to 'libavcodec/proresdec_lgpl.c')
-rw-r--r-- | libavcodec/proresdec_lgpl.c | 112 |
1 files changed, 103 insertions, 9 deletions
diff --git a/libavcodec/proresdec_lgpl.c b/libavcodec/proresdec_lgpl.c index 59c98439fb..d71e593e25 100644 --- a/libavcodec/proresdec_lgpl.c +++ b/libavcodec/proresdec_lgpl.c @@ -134,12 +134,21 @@ static int decode_frame_header(ProresContext *ctx, const uint8_t *buf, ctx->chroma_factor = (buf[12] >> 6) & 3; ctx->mb_chroma_factor = ctx->chroma_factor + 2; ctx->num_chroma_blocks = (1 << ctx->chroma_factor) >> 1; + ctx->alpha_info = buf[17] & 0xf; + + if (ctx->alpha_info > 2) { + av_log(avctx, AV_LOG_ERROR, "Invalid alpha mode %d\n", ctx->alpha_info); + return AVERROR_INVALIDDATA; + } + switch (ctx->chroma_factor) { case 2: - avctx->pix_fmt = AV_PIX_FMT_YUV422P10; + avctx->pix_fmt = ctx->alpha_info ? AV_PIX_FMT_YUVA422P10 + : AV_PIX_FMT_YUV422P10; break; case 3: - avctx->pix_fmt = AV_PIX_FMT_YUV444P10; + avctx->pix_fmt = ctx->alpha_info ? AV_PIX_FMT_YUVA444P10 + : AV_PIX_FMT_YUV444P10; break; default: av_log(avctx, AV_LOG_ERROR, @@ -168,10 +177,6 @@ static int decode_frame_header(ProresContext *ctx, const uint8_t *buf, avctx->color_trc = buf[15]; avctx->colorspace = buf[16]; - ctx->alpha_info = buf[17] & 0xf; - if (ctx->alpha_info) - avpriv_report_missing_feature(avctx, "Alpha channel"); - ctx->qmat_changed = 0; ptr = buf + 20; flags = buf[19]; @@ -466,6 +471,78 @@ static void decode_slice_plane(ProresContext *ctx, ProresThreadData *td, } +static void unpack_alpha(GetBitContext *gb, uint16_t *dst, int num_coeffs, + const int num_bits) +{ + const int mask = (1 << num_bits) - 1; + int i, idx, val, alpha_val; + + idx = 0; + alpha_val = mask; + do { + do { + if (get_bits1(gb)) + val = get_bits(gb, num_bits); + else { + int sign; + val = get_bits(gb, num_bits == 16 ? 7 : 4); + sign = val & 1; + val = (val + 2) >> 1; + if (sign) + val = -val; + } + alpha_val = (alpha_val + val) & mask; + if (num_bits == 16) + dst[idx++] = alpha_val >> 6; + else + dst[idx++] = (alpha_val << 2) | (alpha_val >> 6); + if (idx == num_coeffs - 1) + break; + } while (get_bits1(gb)); + val = get_bits(gb, 4); + if (!val) + val = get_bits(gb, 11); + if (idx + val > num_coeffs) + val = num_coeffs - idx; + if (num_bits == 16) + for (i = 0; i < val; i++) + dst[idx++] = alpha_val >> 6; + else + for (i = 0; i < val; i++) + dst[idx++] = (alpha_val << 2) | (alpha_val >> 6); + } while (idx < num_coeffs); +} + +/** + * Decode alpha slice plane. + */ +static void decode_alpha_plane(ProresContext *ctx, ProresThreadData *td, + const uint8_t *buf, int data_size, + uint16_t *out_ptr, int linesize, + int mbs_per_slice) +{ + GetBitContext gb; + int i; + uint16_t *block_ptr; + + memset(td->blocks, 0, 8 * 4 * 64 * sizeof(*td->blocks)); + + init_get_bits(&gb, buf, data_size << 3); + + if (ctx->alpha_info == 2) + unpack_alpha(&gb, td->blocks, mbs_per_slice * 4 * 64, 16); + else + unpack_alpha(&gb, td->blocks, mbs_per_slice * 4 * 64, 8); + + block_ptr = td->blocks; + + for (i = 0; i < 16; i++) { + memcpy(out_ptr, block_ptr, 16 * mbs_per_slice * sizeof(*out_ptr)); + out_ptr += linesize >> 1; + block_ptr += 16 * mbs_per_slice; + } +} + static int decode_slice(AVCodecContext *avctx, void *tdata) { ProresThreadData *td = tdata; @@ -476,11 +553,12 @@ static int decode_slice(AVCodecContext *avctx, void *tdata) int slice_num = td->slice_num; int mbs_per_slice = td->slice_width; const uint8_t *buf; - uint8_t *y_data, *u_data, *v_data; + uint8_t *y_data, *u_data, *v_data, *a_data; AVFrame *pic = ctx->frame; int i, sf, slice_width_factor; - int slice_data_size, hdr_size, y_data_size, u_data_size, v_data_size; - int y_linesize, u_linesize, v_linesize; + int slice_data_size, hdr_size; + int y_data_size, u_data_size, v_data_size, a_data_size; + int y_linesize, u_linesize, v_linesize, a_linesize; buf = ctx->slice_data[slice_num].index; slice_data_size = ctx->slice_data[slice_num + 1].index - buf; @@ -490,19 +568,23 @@ static int decode_slice(AVCodecContext *avctx, void *tdata) y_data = pic->data[0]; u_data = pic->data[1]; v_data = pic->data[2]; + a_data = pic->data[3]; y_linesize = pic->linesize[0]; u_linesize = pic->linesize[1]; v_linesize = pic->linesize[2]; + a_linesize = pic->linesize[3]; if (pic->interlaced_frame) { if (!(pic_num ^ pic->top_field_first)) { y_data += y_linesize; u_data += u_linesize; v_data += v_linesize; + a_data += a_linesize; } y_linesize <<= 1; u_linesize <<= 1; v_linesize <<= 1; + a_linesize <<= 1; } if (slice_data_size < 6) { @@ -516,6 +598,8 @@ static int decode_slice(AVCodecContext *avctx, void *tdata) u_data_size = AV_RB16(buf + 4); v_data_size = hdr_size > 7 ? AV_RB16(buf + 6) : slice_data_size - y_data_size - u_data_size - hdr_size; + a_data_size = slice_data_size - y_data_size - u_data_size - + v_data_size - hdr_size; if (hdr_size + y_data_size + u_data_size + v_data_size > slice_data_size || v_data_size < 0 || hdr_size < 6) { @@ -560,6 +644,16 @@ static int decode_slice(AVCodecContext *avctx, void *tdata) slice_width_factor + ctx->chroma_factor - 1, td->qmat_chroma_scaled, 1); + /* decode alpha plane if available */ + if (a_data && a_data_size) + decode_alpha_plane(ctx, td, + buf + hdr_size + y_data_size + + u_data_size + v_data_size, + a_data_size, + (uint16_t*) (a_data + (mb_y_pos << 4) * a_linesize + + (mb_x_pos << 5)), a_linesize, + mbs_per_slice); + return 0; } |