/* * 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 "avcodec.h" #include "bytestream.h" #include "canopus.h" #include "codec_internal.h" #include "decode.h" #include "get_bits.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) * 64; 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) * 64; } 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]] = (int)(ff_hq_ac_syms[val] * (unsigned)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, GetByteContext *gbc, int prof_num, size_t data_size) { const HQProfile *profile; GetBitContext gb; const uint8_t *perm, *src = 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(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 %"SIZE_SPECIFIER".\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; if (get_bits_left(gb) < 1) return AVERROR_INVALIDDATA; 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, GetByteContext *gbc, 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 = gbc->buffer; if (bytestream2_get_bytes_left(gbc) < 8 + 4*(num_slices + 1)) return AVERROR_INVALIDDATA; width = bytestream2_get_be16(gbc); height = bytestream2_get_be16(gbc); ret = ff_set_dimensions(ctx->avctx, width, height); if (ret < 0) return ret; ctx->avctx->coded_width = FFALIGN(width, 16); ctx->avctx->coded_height = FFALIGN(height, 16); 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(gbc); bytestream2_skip(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(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 %"SIZE_SPECIFIER".\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, AVFrame *pic, int *got_frame, AVPacket *avpkt) { HQContext *ctx = avctx->priv_data; GetByteContext gbc0, *const gbc = &gbc0; uint32_t info_tag; unsigned int data_size; int ret; unsigned tag; bytestream2_init(gbc, avpkt->data, avpkt->size); if (bytestream2_get_bytes_left(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(gbc); if (info_tag == MKTAG('I', 'N', 'F', 'O')) { int info_size; bytestream2_skip(gbc, 4); info_size = bytestream2_get_le32(gbc); if (info_size < 0 || bytestream2_get_bytes_left(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, gbc->buffer, info_size); bytestream2_skip(gbc, info_size); } data_size = bytestream2_get_bytes_left(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(gbc); if ((tag & 0x00FFFFFF) == (MKTAG('U', 'V', 'C', ' ') & 0x00FFFFFF)) { ret = hq_decode_frame(ctx, pic, gbc, tag >> 24, data_size); } else if (tag == MKTAG('H', 'Q', 'A', '1')) { ret = hqa_decode_frame(ctx, pic, gbc, 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->flags |= AV_FRAME_FLAG_KEY; 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; } const FFCodec ff_hq_hqa_decoder = { .p.name = "hq_hqa", CODEC_LONG_NAME("Canopus HQ/HQA"), .p.type = AVMEDIA_TYPE_VIDEO, .p.id = AV_CODEC_ID_HQ_HQA, .priv_data_size = sizeof(HQContext), .init = hq_hqa_decode_init, FF_CODEC_DECODE_CB(hq_hqa_decode_frame), .close = hq_hqa_decode_close, .p.capabilities = AV_CODEC_CAP_DR1, .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, };