| /* |
| * Canopus HQ/HQA decoder |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <stdint.h> |
| |
| #include "libavutil/attributes.h" |
| #include "libavutil/intreadwrite.h" |
| |
| #include "avcodec.h" |
| #include "canopus.h" |
| #include "internal.h" |
| |
| #include "hq_hqa.h" |
| #include "hq_hqadsp.h" |
| |
| /* HQ/HQA slices are a set of macroblocks belonging to a frame, and |
| * they usually form a pseudorandom pattern (probably because it is |
| * nicer to display on partial decode). |
| * |
| * For HQA it just happens that each slice is on every 8th macroblock, |
| * but they can be on any frame width like |
| * X.......X. |
| * ......X... |
| * ....X..... |
| * ..X....... |
| * etc. |
| * |
| * The original decoder has special handling for edge macroblocks, |
| * while lavc simply aligns coded_width and coded_height. |
| */ |
| |
| static inline void put_blocks(HQContext *c, AVFrame *pic, |
| int plane, int x, int y, int ilace, |
| int16_t *block0, int16_t *block1) |
| { |
| uint8_t *p = pic->data[plane] + x; |
| |
| c->hqhqadsp.idct_put(p + y * pic->linesize[plane], |
| pic->linesize[plane] << ilace, block0); |
| c->hqhqadsp.idct_put(p + (y + (ilace ? 1 : 8)) * pic->linesize[plane], |
| pic->linesize[plane] << ilace, block1); |
| } |
| |
| static int hq_decode_block(HQContext *c, GetBitContext *gb, int16_t block[64], |
| int qsel, int is_chroma, int is_hqa) |
| { |
| const int32_t *q; |
| int val, pos = 1; |
| |
| memset(block, 0, 64 * sizeof(*block)); |
| |
| if (!is_hqa) { |
| block[0] = get_sbits(gb, 9) << 6; |
| q = ff_hq_quants[qsel][is_chroma][get_bits(gb, 2)]; |
| } else { |
| q = ff_hq_quants[qsel][is_chroma][get_bits(gb, 2)]; |
| block[0] = get_sbits(gb, 9) << 6; |
| } |
| |
| for (;;) { |
| val = get_vlc2(gb, c->hq_ac_vlc.table, 9, 2); |
| if (val < 0) |
| return AVERROR_INVALIDDATA; |
| |
| pos += ff_hq_ac_skips[val]; |
| if (pos >= 64) |
| break; |
| block[ff_zigzag_direct[pos]] = (ff_hq_ac_syms[val] * q[pos]) >> 12; |
| pos++; |
| } |
| |
| return 0; |
| } |
| |
| static int hq_decode_mb(HQContext *c, AVFrame *pic, |
| GetBitContext *gb, int x, int y) |
| { |
| int qgroup, flag; |
| int i, ret; |
| |
| qgroup = get_bits(gb, 4); |
| flag = get_bits1(gb); |
| |
| for (i = 0; i < 8; i++) { |
| ret = hq_decode_block(c, gb, c->block[i], qgroup, i >= 4, 0); |
| if (ret < 0) |
| return ret; |
| } |
| |
| put_blocks(c, pic, 0, x, y, flag, c->block[0], c->block[2]); |
| put_blocks(c, pic, 0, x + 8, y, flag, c->block[1], c->block[3]); |
| put_blocks(c, pic, 2, x >> 1, y, flag, c->block[4], c->block[5]); |
| put_blocks(c, pic, 1, x >> 1, y, flag, c->block[6], c->block[7]); |
| |
| return 0; |
| } |
| |
| static int hq_decode_frame(HQContext *ctx, AVFrame *pic, |
| int prof_num, size_t data_size) |
| { |
| const HQProfile *profile; |
| GetBitContext gb; |
| const uint8_t *perm, *src = ctx->gbc.buffer; |
| uint32_t slice_off[21]; |
| int slice, start_off, next_off, i, ret; |
| |
| if ((unsigned)prof_num >= NUM_HQ_PROFILES) { |
| profile = &ff_hq_profile[0]; |
| avpriv_request_sample(ctx->avctx, "HQ Profile %d", prof_num); |
| } else { |
| profile = &ff_hq_profile[prof_num]; |
| av_log(ctx->avctx, AV_LOG_VERBOSE, "HQ Profile %d\n", prof_num); |
| } |
| |
| ctx->avctx->coded_width = FFALIGN(profile->width, 16); |
| ctx->avctx->coded_height = FFALIGN(profile->height, 16); |
| ctx->avctx->width = profile->width; |
| ctx->avctx->height = profile->height; |
| ctx->avctx->bits_per_raw_sample = 8; |
| ctx->avctx->pix_fmt = AV_PIX_FMT_YUV422P; |
| |
| ret = ff_get_buffer(ctx->avctx, pic, 0); |
| if (ret < 0) |
| return ret; |
| |
| /* Offsets are stored from CUV position, so adjust them accordingly. */ |
| for (i = 0; i < profile->num_slices + 1; i++) |
| slice_off[i] = bytestream2_get_be24(&ctx->gbc) - 4; |
| |
| next_off = 0; |
| for (slice = 0; slice < profile->num_slices; slice++) { |
| start_off = next_off; |
| next_off = profile->tab_h * (slice + 1) / profile->num_slices; |
| perm = profile->perm_tab + start_off * profile->tab_w * 2; |
| |
| if (slice_off[slice] < (profile->num_slices + 1) * 3 || |
| slice_off[slice] >= slice_off[slice + 1] || |
| slice_off[slice + 1] > data_size) { |
| av_log(ctx->avctx, AV_LOG_ERROR, |
| "Invalid slice size %zu.\n", data_size); |
| break; |
| } |
| init_get_bits(&gb, src + slice_off[slice], |
| (slice_off[slice + 1] - slice_off[slice]) * 8); |
| |
| for (i = 0; i < (next_off - start_off) * profile->tab_w; i++) { |
| ret = hq_decode_mb(ctx, pic, &gb, perm[0] * 16, perm[1] * 16); |
| if (ret < 0) { |
| av_log(ctx->avctx, AV_LOG_ERROR, |
| "Error decoding macroblock %d at slice %d.\n", i, slice); |
| return ret; |
| } |
| perm += 2; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int hqa_decode_mb(HQContext *c, AVFrame *pic, int qgroup, |
| GetBitContext *gb, int x, int y) |
| { |
| int flag = 0; |
| int i, ret, cbp; |
| |
| cbp = get_vlc2(gb, c->hqa_cbp_vlc.table, 5, 1); |
| |
| for (i = 0; i < 12; i++) |
| memset(c->block[i], 0, sizeof(*c->block)); |
| for (i = 0; i < 12; i++) |
| c->block[i][0] = -128 * (1 << 6); |
| |
| if (cbp) { |
| flag = get_bits1(gb); |
| |
| cbp |= cbp << 4; |
| if (cbp & 0x3) |
| cbp |= 0x500; |
| if (cbp & 0xC) |
| cbp |= 0xA00; |
| for (i = 0; i < 12; i++) { |
| if (!(cbp & (1 << i))) |
| continue; |
| ret = hq_decode_block(c, gb, c->block[i], qgroup, i >= 8, 1); |
| if (ret < 0) |
| return ret; |
| } |
| } |
| |
| put_blocks(c, pic, 3, x, y, flag, c->block[ 0], c->block[ 2]); |
| put_blocks(c, pic, 3, x + 8, y, flag, c->block[ 1], c->block[ 3]); |
| put_blocks(c, pic, 0, x, y, flag, c->block[ 4], c->block[ 6]); |
| put_blocks(c, pic, 0, x + 8, y, flag, c->block[ 5], c->block[ 7]); |
| put_blocks(c, pic, 2, x >> 1, y, flag, c->block[ 8], c->block[ 9]); |
| put_blocks(c, pic, 1, x >> 1, y, flag, c->block[10], c->block[11]); |
| |
| return 0; |
| } |
| |
| static int hqa_decode_slice(HQContext *ctx, AVFrame *pic, GetBitContext *gb, |
| int quant, int slice_no, int w, int h) |
| { |
| int i, j, off; |
| int ret; |
| |
| for (i = 0; i < h; i += 16) { |
| off = (slice_no * 16 + i * 3) & 0x70; |
| for (j = off; j < w; j += 128) { |
| ret = hqa_decode_mb(ctx, pic, quant, gb, j, i); |
| if (ret < 0) { |
| av_log(ctx->avctx, AV_LOG_ERROR, |
| "Error decoding macroblock at %dx%d.\n", i, j); |
| return ret; |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int hqa_decode_frame(HQContext *ctx, AVFrame *pic, size_t data_size) |
| { |
| GetBitContext gb; |
| const int num_slices = 8; |
| uint32_t slice_off[9]; |
| int i, slice, ret; |
| int width, height, quant; |
| const uint8_t *src = ctx->gbc.buffer; |
| |
| width = bytestream2_get_be16(&ctx->gbc); |
| height = bytestream2_get_be16(&ctx->gbc); |
| |
| ctx->avctx->coded_width = FFALIGN(width, 16); |
| ctx->avctx->coded_height = FFALIGN(height, 16); |
| ctx->avctx->width = width; |
| ctx->avctx->height = height; |
| ctx->avctx->bits_per_raw_sample = 8; |
| ctx->avctx->pix_fmt = AV_PIX_FMT_YUVA422P; |
| |
| av_log(ctx->avctx, AV_LOG_VERBOSE, "HQA Profile\n"); |
| |
| quant = bytestream2_get_byte(&ctx->gbc); |
| bytestream2_skip(&ctx->gbc, 3); |
| if (quant >= NUM_HQ_QUANTS) { |
| av_log(ctx->avctx, AV_LOG_ERROR, |
| "Invalid quantization matrix %d.\n", quant); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| ret = ff_get_buffer(ctx->avctx, pic, 0); |
| if (ret < 0) |
| return ret; |
| |
| /* Offsets are stored from HQA1 position, so adjust them accordingly. */ |
| for (i = 0; i < num_slices + 1; i++) |
| slice_off[i] = bytestream2_get_be32(&ctx->gbc) - 4; |
| |
| for (slice = 0; slice < num_slices; slice++) { |
| if (slice_off[slice] < (num_slices + 1) * 3 || |
| slice_off[slice] >= slice_off[slice + 1] || |
| slice_off[slice + 1] > data_size) { |
| av_log(ctx->avctx, AV_LOG_ERROR, |
| "Invalid slice size %zu.\n", data_size); |
| break; |
| } |
| init_get_bits(&gb, src + slice_off[slice], |
| (slice_off[slice + 1] - slice_off[slice]) * 8); |
| |
| ret = hqa_decode_slice(ctx, pic, &gb, quant, slice, width, height); |
| if (ret < 0) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static int hq_hqa_decode_frame(AVCodecContext *avctx, void *data, |
| int *got_frame, AVPacket *avpkt) |
| { |
| HQContext *ctx = avctx->priv_data; |
| AVFrame *pic = data; |
| uint32_t info_tag; |
| unsigned int data_size; |
| int ret; |
| unsigned tag; |
| |
| bytestream2_init(&ctx->gbc, avpkt->data, avpkt->size); |
| if (bytestream2_get_bytes_left(&ctx->gbc) < 4 + 4) { |
| av_log(avctx, AV_LOG_ERROR, "Frame is too small (%d).\n", avpkt->size); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| info_tag = bytestream2_peek_le32(&ctx->gbc); |
| if (info_tag == MKTAG('I', 'N', 'F', 'O')) { |
| int info_size; |
| bytestream2_skip(&ctx->gbc, 4); |
| info_size = bytestream2_get_le32(&ctx->gbc); |
| if (bytestream2_get_bytes_left(&ctx->gbc) < info_size) { |
| av_log(avctx, AV_LOG_ERROR, "Invalid INFO size (%d).\n", info_size); |
| return AVERROR_INVALIDDATA; |
| } |
| ff_canopus_parse_info_tag(avctx, ctx->gbc.buffer, info_size); |
| |
| bytestream2_skip(&ctx->gbc, info_size); |
| } |
| |
| data_size = bytestream2_get_bytes_left(&ctx->gbc); |
| if (data_size < 4) { |
| av_log(avctx, AV_LOG_ERROR, "Frame is too small (%d).\n", data_size); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| /* HQ defines dimensions and number of slices, and thus slice traversal |
| * order. HQA has no size constraint and a fixed number of slices, so it |
| * needs a separate scheme for it. */ |
| tag = bytestream2_get_le32(&ctx->gbc); |
| if ((tag & 0x00FFFFFF) == (MKTAG('U', 'V', 'C', ' ') & 0x00FFFFFF)) { |
| ret = hq_decode_frame(ctx, pic, tag >> 24, data_size); |
| } else if (tag == MKTAG('H', 'Q', 'A', '1')) { |
| ret = hqa_decode_frame(ctx, pic, data_size); |
| } else { |
| av_log(avctx, AV_LOG_ERROR, "Not a HQ/HQA frame.\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| if (ret < 0) { |
| av_log(avctx, AV_LOG_ERROR, "Error decoding frame.\n"); |
| return ret; |
| } |
| |
| pic->key_frame = 1; |
| pic->pict_type = AV_PICTURE_TYPE_I; |
| |
| *got_frame = 1; |
| |
| return avpkt->size; |
| } |
| |
| static av_cold int hq_hqa_decode_init(AVCodecContext *avctx) |
| { |
| HQContext *ctx = avctx->priv_data; |
| ctx->avctx = avctx; |
| |
| ff_hqdsp_init(&ctx->hqhqadsp); |
| |
| return ff_hq_init_vlcs(ctx); |
| } |
| |
| static av_cold int hq_hqa_decode_close(AVCodecContext *avctx) |
| { |
| HQContext *ctx = avctx->priv_data; |
| |
| ff_free_vlc(&ctx->hq_ac_vlc); |
| ff_free_vlc(&ctx->hqa_cbp_vlc); |
| |
| return 0; |
| } |
| |
| AVCodec ff_hq_hqa_decoder = { |
| .name = "hq_hqa", |
| .long_name = NULL_IF_CONFIG_SMALL("Canopus HQ/HQA"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_HQ_HQA, |
| .priv_data_size = sizeof(HQContext), |
| .init = hq_hqa_decode_init, |
| .decode = hq_hqa_decode_frame, |
| .close = hq_hqa_decode_close, |
| .capabilities = AV_CODEC_CAP_DR1, |
| .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | |
| FF_CODEC_CAP_INIT_CLEANUP, |
| }; |
