/* * Apple ProRes compatible decoder * * Copyright (c) 2010-2011 Maxim Poliakovski * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * This is a decoder for Apple ProRes 422 SD/HQ/LT/Proxy and ProRes 4444. * It is used for storing and editing high definition video data in Apple's Final Cut Pro. * * @see http://wiki.multimedia.cx/index.php?title=Apple_ProRes */ #define LONG_BITSTREAM_READER // some ProRes vlc codes require up to 28 bits to be read at once #include #include "libavutil/intmath.h" #include "avcodec.h" #include "proresdata.h" #include "proresdsp.h" #include "get_bits.h" typedef struct { const uint8_t *index; ///< pointers to the data of this slice int slice_num; int x_pos, y_pos; int slice_width; int prev_slice_sf; ///< scalefactor of the previous decoded slice DECLARE_ALIGNED(16, DCTELEM, blocks)[8 * 4 * 64]; DECLARE_ALIGNED(16, int16_t, qmat_luma_scaled)[64]; DECLARE_ALIGNED(16, int16_t, qmat_chroma_scaled)[64]; } ProresThreadData; typedef struct { ProresDSPContext dsp; AVFrame picture; ScanTable scantable; int scantable_type; ///< -1 = uninitialized, 0 = progressive, 1/2 = interlaced int frame_type; ///< 0 = progressive, 1 = top-field first, 2 = bottom-field first int pic_format; ///< 2 = 422, 3 = 444 uint8_t qmat_luma[64]; ///< dequantization matrix for luma uint8_t qmat_chroma[64]; ///< dequantization matrix for chroma int qmat_changed; ///< 1 - global quantization matrices changed int total_slices; ///< total number of slices in a picture ProresThreadData *slice_data; int pic_num; int chroma_factor; int mb_chroma_factor; int num_chroma_blocks; ///< number of chrominance blocks in a macroblock int num_x_slices; int num_y_slices; int slice_width_factor; int slice_height_factor; int num_x_mbs; int num_y_mbs; int alpha_info; } ProresContext; static av_cold int decode_init(AVCodecContext *avctx) { ProresContext *ctx = avctx->priv_data; ctx->total_slices = 0; ctx->slice_data = NULL; avctx->bits_per_raw_sample = PRORES_BITS_PER_SAMPLE; ff_proresdsp_init(&ctx->dsp, avctx); avctx->coded_frame = &ctx->picture; avcodec_get_frame_defaults(&ctx->picture); ctx->picture.type = AV_PICTURE_TYPE_I; ctx->picture.key_frame = 1; ctx->scantable_type = -1; // set scantable type to uninitialized memset(ctx->qmat_luma, 4, 64); memset(ctx->qmat_chroma, 4, 64); return 0; } static int decode_frame_header(ProresContext *ctx, const uint8_t *buf, const int data_size, AVCodecContext *avctx) { int hdr_size, version, width, height, flags; const uint8_t *ptr; hdr_size = AV_RB16(buf); if (hdr_size > data_size) { av_log(avctx, AV_LOG_ERROR, "frame data too small\n"); return AVERROR_INVALIDDATA; } version = AV_RB16(buf + 2); if (version >= 2) { av_log(avctx, AV_LOG_ERROR, "unsupported header version: %d\n", version); return AVERROR_INVALIDDATA; } width = AV_RB16(buf + 8); height = AV_RB16(buf + 10); if (width != avctx->width || height != avctx->height) { av_log(avctx, AV_LOG_ERROR, "picture dimension changed: old: %d x %d, new: %d x %d\n", avctx->width, avctx->height, width, height); return AVERROR_INVALIDDATA; } ctx->frame_type = (buf[12] >> 2) & 3; if (ctx->frame_type > 2) { av_log(avctx, AV_LOG_ERROR, "unsupported frame type: %d\n", ctx->frame_type); return AVERROR_INVALIDDATA; } ctx->chroma_factor = (buf[12] >> 6) & 3; ctx->mb_chroma_factor = ctx->chroma_factor + 2; ctx->num_chroma_blocks = (1 << ctx->chroma_factor) >> 1; switch (ctx->chroma_factor) { case 2: avctx->pix_fmt = PIX_FMT_YUV422P10; break; case 3: avctx->pix_fmt = PIX_FMT_YUV444P10; break; default: av_log(avctx, AV_LOG_ERROR, "unsupported picture format: %d\n", ctx->pic_format); return AVERROR_INVALIDDATA; } if (ctx->scantable_type != ctx->frame_type) { if (!ctx->frame_type) ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, ff_prores_progressive_scan); else ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, ff_prores_interlaced_scan); ctx->scantable_type = ctx->frame_type; } if (ctx->frame_type) { /* if interlaced */ ctx->picture.interlaced_frame = 1; ctx->picture.top_field_first = ctx->frame_type & 1; } ctx->alpha_info = buf[17] & 0xf; if (ctx->alpha_info) av_log_missing_feature(avctx, "alpha channel", 0); ctx->qmat_changed = 0; ptr = buf + 20; flags = buf[19]; if (flags & 2) { if (ptr - buf > hdr_size - 64) { av_log(avctx, AV_LOG_ERROR, "header data too small\n"); return AVERROR_INVALIDDATA; } if (memcmp(ctx->qmat_luma, ptr, 64)) { memcpy(ctx->qmat_luma, ptr, 64); ctx->qmat_changed = 1; } ptr += 64; } else { memset(ctx->qmat_luma, 4, 64); ctx->qmat_changed = 1; } if (flags & 1) { if (ptr - buf > hdr_size - 64) { av_log(avctx, AV_LOG_ERROR, "header data too small\n"); return -1; } if (memcmp(ctx->qmat_chroma, ptr, 64)) { memcpy(ctx->qmat_chroma, ptr, 64); ctx->qmat_changed = 1; } } else { memset(ctx->qmat_chroma, 4, 64); ctx->qmat_changed = 1; } return hdr_size; } static int decode_picture_header(ProresContext *ctx, const uint8_t *buf, const int data_size, AVCodecContext *avctx) { int i, hdr_size, pic_data_size, num_slices; int slice_width_factor, slice_height_factor; int remainder, num_x_slices; const uint8_t *data_ptr, *index_ptr; hdr_size = data_size > 0 ? buf[0] >> 3 : 0; if (hdr_size < 8 || hdr_size > data_size) { av_log(avctx, AV_LOG_ERROR, "picture header too small\n"); return AVERROR_INVALIDDATA; } pic_data_size = AV_RB32(buf + 1); if (pic_data_size > data_size) { av_log(avctx, AV_LOG_ERROR, "picture data too small\n"); return AVERROR_INVALIDDATA; } slice_width_factor = buf[7] >> 4; slice_height_factor = buf[7] & 0xF; if (slice_width_factor > 3 || slice_height_factor) { av_log(avctx, AV_LOG_ERROR, "unsupported slice dimension: %d x %d\n", 1 << slice_width_factor, 1 << slice_height_factor); return AVERROR_INVALIDDATA; } ctx->slice_width_factor = slice_width_factor; ctx->slice_height_factor = slice_height_factor; ctx->num_x_mbs = (avctx->width + 15) >> 4; ctx->num_y_mbs = (avctx->height + (1 << (4 + ctx->picture.interlaced_frame)) - 1) >> (4 + ctx->picture.interlaced_frame); remainder = ctx->num_x_mbs & ((1 << slice_width_factor) - 1); num_x_slices = (ctx->num_x_mbs >> slice_width_factor) + (remainder & 1) + ((remainder >> 1) & 1) + ((remainder >> 2) & 1); num_slices = num_x_slices * ctx->num_y_mbs; if (num_slices != AV_RB16(buf + 5)) { av_log(avctx, AV_LOG_ERROR, "invalid number of slices\n"); return AVERROR_INVALIDDATA; } if (ctx->total_slices != num_slices) { av_freep(&ctx->slice_data); ctx->slice_data = av_malloc((num_slices + 1) * sizeof(ctx->slice_data[0])); if (!ctx->slice_data) return AVERROR(ENOMEM); ctx->total_slices = num_slices; } if (hdr_size + num_slices * 2 > data_size) { av_log(avctx, AV_LOG_ERROR, "slice table too small\n"); return AVERROR_INVALIDDATA; } /* parse slice table allowing quick access to the slice data */ index_ptr = buf + hdr_size; data_ptr = index_ptr + num_slices * 2; for (i = 0; i < num_slices; i++) { ctx->slice_data[i].index = data_ptr; ctx->slice_data[i].prev_slice_sf = 0; data_ptr += AV_RB16(index_ptr + i * 2); } ctx->slice_data[i].index = data_ptr; ctx->slice_data[i].prev_slice_sf = 0; if (data_ptr > buf + data_size) { av_log(avctx, AV_LOG_ERROR, "out of slice data\n"); return -1; } return pic_data_size; } /** * Read an unsigned rice/exp golomb codeword. */ static inline int decode_vlc_codeword(GetBitContext *gb, unsigned codebook) { unsigned int rice_order, exp_order, switch_bits; unsigned int buf, code; int log, prefix_len, len; OPEN_READER(re, gb); UPDATE_CACHE(re, gb); buf = GET_CACHE(re, gb); /* number of prefix bits to switch between Rice and expGolomb */ switch_bits = (codebook & 3) + 1; rice_order = codebook >> 5; /* rice code order */ exp_order = (codebook >> 2) & 7; /* exp golomb code order */ log = 31 - av_log2(buf); /* count prefix bits (zeroes) */ if (log < switch_bits) { /* ok, we got a rice code */ if (!rice_order) { /* shortcut for faster decoding of rice codes without remainder */ code = log; LAST_SKIP_BITS(re, gb, log + 1); } else { prefix_len = log + 1; code = (log << rice_order) + NEG_USR32(buf << prefix_len, rice_order); LAST_SKIP_BITS(re, gb, prefix_len + rice_order); } } else { /* otherwise we got a exp golomb code */ len = (log << 1) - switch_bits + exp_order + 1; code = NEG_USR32(buf, len) - (1 << exp_order) + (switch_bits << rice_order); LAST_SKIP_BITS(re, gb, len); } CLOSE_READER(re, gb); return code; } #define LSB2SIGN(x) (-((x) & 1)) #define TOSIGNED(x) (((x) >> 1) ^ LSB2SIGN(x)) /** * Decode DC coefficients for all blocks in a slice. */ static inline void decode_dc_coeffs(GetBitContext *gb, DCTELEM *out, int nblocks) { DCTELEM prev_dc; int i, sign; int16_t delta; unsigned int code; code = decode_vlc_codeword(gb, FIRST_DC_CB); out[0] = prev_dc = TOSIGNED(code); out += 64; /* move to the DC coeff of the next block */ delta = 3; for (i = 1; i < nblocks; i++, out += 64) { code = decode_vlc_codeword(gb, ff_prores_dc_codebook[FFMIN(FFABS(delta), 3)]); sign = -(((delta >> 15) & 1) ^ (code & 1)); delta = (((code + 1) >> 1) ^ sign) - sign; prev_dc += delta; out[0] = prev_dc; } } /** * Decode AC coefficients for all blocks in a slice. */ static inline void decode_ac_coeffs(GetBitContext *gb, DCTELEM *out, int blocks_per_slice, int plane_size_factor, const uint8_t *scan) { int pos, block_mask, run, level, sign, run_cb_index, lev_cb_index; int max_coeffs, bits_left; /* set initial prediction values */ run = 4; level = 2; max_coeffs = blocks_per_slice << 6; block_mask = blocks_per_slice - 1; for (pos = blocks_per_slice - 1; pos < max_coeffs;) { run_cb_index = ff_prores_run_to_cb_index[FFMIN(run, 15)]; lev_cb_index = ff_prores_lev_to_cb_index[FFMIN(level, 9)]; bits_left = get_bits_left(gb); if (bits_left <= 0 || (bits_left <= 8 && !show_bits(gb, bits_left))) return; run = decode_vlc_codeword(gb, ff_prores_ac_codebook[run_cb_index]); bits_left = get_bits_left(gb); if (bits_left <= 0 || (bits_left <= 8 && !show_bits(gb, bits_left))) return; level = decode_vlc_codeword(gb, ff_prores_ac_codebook[lev_cb_index]) + 1; pos += run + 1; if (pos >= max_coeffs) break; sign = get_sbits(gb, 1); out[((pos & block_mask) << 6) + scan[pos >> plane_size_factor]] = (level ^ sign) - sign; } } /** * Decode a slice plane (luma or chroma). */ static void decode_slice_plane(ProresContext *ctx, ProresThreadData *td, const uint8_t *buf, int data_size, uint16_t *out_ptr, int linesize, int mbs_per_slice, int blocks_per_mb, int plane_size_factor, const int16_t *qmat) { GetBitContext gb; DCTELEM *block_ptr; int mb_num, blocks_per_slice; blocks_per_slice = mbs_per_slice * blocks_per_mb; memset(td->blocks, 0, 8 * 4 * 64 * sizeof(*td->blocks)); init_get_bits(&gb, buf, data_size << 3); decode_dc_coeffs(&gb, td->blocks, blocks_per_slice); decode_ac_coeffs(&gb, td->blocks, blocks_per_slice, plane_size_factor, ctx->scantable.permutated); /* inverse quantization, inverse transform and output */ block_ptr = td->blocks; for (mb_num = 0; mb_num < mbs_per_slice; mb_num++, out_ptr += blocks_per_mb * 4) { ctx->dsp.idct_put(out_ptr, linesize, block_ptr, qmat); block_ptr += 64; if (blocks_per_mb > 2) { ctx->dsp.idct_put(out_ptr + 8, linesize, block_ptr, qmat); block_ptr += 64; } ctx->dsp.idct_put(out_ptr + linesize * 4, linesize, block_ptr, qmat); block_ptr += 64; if (blocks_per_mb > 2) { ctx->dsp.idct_put(out_ptr + linesize * 4 + 8, linesize, block_ptr, qmat); block_ptr += 64; } } } static int decode_slice(AVCodecContext *avctx, void *tdata) { ProresThreadData *td = tdata; ProresContext *ctx = avctx->priv_data; int mb_x_pos = td->x_pos; int mb_y_pos = td->y_pos; int pic_num = ctx->pic_num; 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; AVFrame *pic = avctx->coded_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; buf = ctx->slice_data[slice_num].index; slice_data_size = ctx->slice_data[slice_num + 1].index - buf; slice_width_factor = av_log2(mbs_per_slice); y_data = pic->data[0]; u_data = pic->data[1]; v_data = pic->data[2]; y_linesize = pic->linesize[0]; u_linesize = pic->linesize[1]; v_linesize = pic->linesize[2]; if (pic->interlaced_frame) { if (!(pic_num ^ pic->top_field_first)) { y_data += y_linesize; u_data += u_linesize; v_data += v_linesize; } y_linesize <<= 1; u_linesize <<= 1; v_linesize <<= 1; } if (slice_data_size < 6) { av_log(avctx, AV_LOG_ERROR, "slice data too small\n"); return AVERROR_INVALIDDATA; } /* parse slice header */ hdr_size = buf[0] >> 3; y_data_size = AV_RB16(buf + 2); 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; if (hdr_size + y_data_size + u_data_size + v_data_size > slice_data_size || v_data_size < 0 || hdr_size < 6) { av_log(avctx, AV_LOG_ERROR, "invalid data size\n"); return AVERROR_INVALIDDATA; } sf = av_clip(buf[1], 1, 224); sf = sf > 128 ? (sf - 96) << 2 : sf; /* scale quantization matrixes according with slice's scale factor */ /* TODO: this can be SIMD-optimized a lot */ if (ctx->qmat_changed || sf != td->prev_slice_sf) { td->prev_slice_sf = sf; for (i = 0; i < 64; i++) { td->qmat_luma_scaled[ctx->dsp.idct_permutation[i]] = ctx->qmat_luma[i] * sf; td->qmat_chroma_scaled[ctx->dsp.idct_permutation[i]] = ctx->qmat_chroma[i] * sf; } } /* decode luma plane */ decode_slice_plane(ctx, td, buf + hdr_size, y_data_size, (uint16_t*) (y_data + (mb_y_pos << 4) * y_linesize + (mb_x_pos << 5)), y_linesize, mbs_per_slice, 4, slice_width_factor + 2, td->qmat_luma_scaled); /* decode U chroma plane */ decode_slice_plane(ctx, td, buf + hdr_size + y_data_size, u_data_size, (uint16_t*) (u_data + (mb_y_pos << 4) * u_linesize + (mb_x_pos << ctx->mb_chroma_factor)), u_linesize, mbs_per_slice, ctx->num_chroma_blocks, slice_width_factor + ctx->chroma_factor - 1, td->qmat_chroma_scaled); /* decode V chroma plane */ decode_slice_plane(ctx, td, buf + hdr_size + y_data_size + u_data_size, v_data_size, (uint16_t*) (v_data + (mb_y_pos << 4) * v_linesize + (mb_x_pos << ctx->mb_chroma_factor)), v_linesize, mbs_per_slice, ctx->num_chroma_blocks, slice_width_factor + ctx->chroma_factor - 1, td->qmat_chroma_scaled); return 0; } static int decode_picture(ProresContext *ctx, int pic_num, AVCodecContext *avctx) { int slice_num, slice_width, x_pos, y_pos; slice_num = 0; ctx->pic_num = pic_num; for (y_pos = 0; y_pos < ctx->num_y_mbs; y_pos++) { slice_width = 1 << ctx->slice_width_factor; for (x_pos = 0; x_pos < ctx->num_x_mbs && slice_width; x_pos += slice_width) { while (ctx->num_x_mbs - x_pos < slice_width) slice_width >>= 1; ctx->slice_data[slice_num].slice_num = slice_num; ctx->slice_data[slice_num].x_pos = x_pos; ctx->slice_data[slice_num].y_pos = y_pos; ctx->slice_data[slice_num].slice_width = slice_width; slice_num++; } } return avctx->execute(avctx, decode_slice, ctx->slice_data, NULL, slice_num, sizeof(ctx->slice_data[0])); } #define MOVE_DATA_PTR(nbytes) buf += (nbytes); buf_size -= (nbytes) static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) { ProresContext *ctx = avctx->priv_data; AVFrame *picture = avctx->coded_frame; const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; int frame_hdr_size, pic_num, pic_data_size; /* check frame atom container */ if (buf_size < 28 || buf_size < AV_RB32(buf) || AV_RB32(buf + 4) != FRAME_ID) { av_log(avctx, AV_LOG_ERROR, "invalid frame\n"); return AVERROR_INVALIDDATA; } MOVE_DATA_PTR(8); frame_hdr_size = decode_frame_header(ctx, buf, buf_size, avctx); if (frame_hdr_size < 0) return AVERROR_INVALIDDATA; MOVE_DATA_PTR(frame_hdr_size); if (picture->data[0]) avctx->release_buffer(avctx, picture); picture->reference = 0; if (avctx->get_buffer(avctx, picture) < 0) return -1; for (pic_num = 0; ctx->picture.interlaced_frame - pic_num + 1; pic_num++) { pic_data_size = decode_picture_header(ctx, buf, buf_size, avctx); if (pic_data_size < 0) return AVERROR_INVALIDDATA; if (decode_picture(ctx, pic_num, avctx)) return -1; MOVE_DATA_PTR(pic_data_size); } *data_size = sizeof(AVPicture); *(AVFrame*) data = *avctx->coded_frame; return avpkt->size; } static av_cold int decode_close(AVCodecContext *avctx) { ProresContext *ctx = avctx->priv_data; if (ctx->picture.data[0]) avctx->release_buffer(avctx, &ctx->picture); av_freep(&ctx->slice_data); return 0; } AVCodec ff_prores_lgpl_decoder = { .name = "prores_lgpl", .type = AVMEDIA_TYPE_VIDEO, .id = CODEC_ID_PRORES, .priv_data_size = sizeof(ProresContext), .init = decode_init, .close = decode_close, .decode = decode_frame, .capabilities = CODEC_CAP_DR1 | CODEC_CAP_SLICE_THREADS, .long_name = NULL_IF_CONFIG_SMALL("Apple ProRes (iCodec Pro)") };