mirror of https://github.com/FFmpeg/FFmpeg.git
At the moment it only does BGR24, but I plan to add the rest after. Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>pull/28/head
Derek Buitenhuis
13 years ago
parent
19cf7163c1
commit
45eaac02cb
8 changed files with 292 additions and 2 deletions
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/*
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* Canopus Lossless Codec decoder |
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* |
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* Copyright (c) 2012 Derek Buitenhuis |
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* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "libavutil/intreadwrite.h" |
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#include "dsputil.h" |
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#include "get_bits.h" |
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#include "avcodec.h" |
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typedef struct CLLCContext { |
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DSPContext dsp; |
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AVCodecContext *avctx; |
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uint8_t *swapped_buf; |
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int swapped_buf_size; |
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} CLLCContext; |
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static int read_code_table(CLLCContext *ctx, GetBitContext *gb, VLC *vlc) |
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{ |
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uint8_t symbols[256]; |
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uint8_t bits[256]; |
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uint16_t codes[256]; |
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int num_lens, num_codes, num_codes_sum, prefix; |
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int i, j, count; |
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prefix = 0; |
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count = 0; |
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num_codes_sum = 0; |
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num_lens = get_bits(gb, 5); |
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for (i = 0; i < num_lens; i++) { |
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num_codes = get_bits(gb, 9); |
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num_codes_sum += num_codes; |
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if (num_codes_sum > 256) { |
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vlc->table = NULL; |
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av_log(ctx->avctx, AV_LOG_ERROR, |
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"Too many VLCs (%d) to be read.\n", num_codes_sum); |
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return AVERROR_INVALIDDATA; |
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} |
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for (j = 0; j < num_codes; j++) { |
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symbols[count] = get_bits(gb, 8); |
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bits[count] = i + 1; |
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codes[count] = prefix++; |
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count++; |
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} |
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prefix <<= 1; |
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} |
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return ff_init_vlc_sparse(vlc, 7, count, bits, 1, 1, |
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codes, 2, 2, symbols, 1, 1, 0); |
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} |
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static int read_line(CLLCContext *ctx, GetBitContext *gb, int *top_left, |
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VLC *vlc, uint8_t *outbuf) |
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{ |
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uint8_t *dst; |
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int pred, code; |
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int i; |
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OPEN_READER(bits, gb); |
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dst = outbuf; |
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pred = *top_left; |
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/* Simultaneously read and restore the line */ |
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for (i = 0; i < ctx->avctx->width; i++) { |
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UPDATE_CACHE(bits, gb); |
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GET_VLC(code, bits, gb, vlc->table, 7, 2); |
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pred += code; |
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dst[0] = pred; |
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dst += 3; |
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} |
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CLOSE_READER(bits, gb); |
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/* Stash the first pixel */ |
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*top_left = dst[-3 * ctx->avctx->width]; |
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return 0; |
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} |
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static int decode_bgr24_frame(CLLCContext *ctx, GetBitContext *gb, AVFrame *pic) |
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{ |
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AVCodecContext *avctx = ctx->avctx; |
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uint8_t *dst; |
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int pred[3]; |
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int ret; |
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int i, j; |
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VLC vlc[3]; |
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pred[0] = 0x80; |
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pred[1] = 0x80; |
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pred[2] = 0x80; |
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dst = pic->data[0]; |
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skip_bits(gb, 16); |
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/* Read in code table for each plane */ |
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for (i = 0; i < 3; i++) { |
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ret = read_code_table(ctx, gb, &vlc[i]); |
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if (ret < 0) { |
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for (j = 0; j <= i; j++) |
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ff_free_vlc(&vlc[j]); |
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av_log(ctx->avctx, AV_LOG_ERROR, |
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"Could not read code table %d.\n", i); |
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return ret; |
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} |
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} |
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/* Read in and restore every line */ |
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for (i = 0; i < avctx->height; i++) { |
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for (j = 0; j < 3; j++) |
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read_line(ctx, gb, &pred[j], &vlc[j], &dst[j]); |
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dst += pic->linesize[0]; |
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} |
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for (i = 0; i < 3; i++) |
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ff_free_vlc(&vlc[i]); |
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return 0; |
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} |
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static int cllc_decode_frame(AVCodecContext *avctx, void *data, |
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int *got_picture_ptr, AVPacket *avpkt) |
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{ |
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CLLCContext *ctx = avctx->priv_data; |
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AVFrame *pic = avctx->coded_frame; |
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uint8_t *src = avpkt->data; |
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uint8_t *swapped_buf_new; |
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uint32_t info_tag, info_offset; |
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GetBitContext gb; |
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int coding_type, ret; |
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if (pic->data[0]) |
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avctx->release_buffer(avctx, pic); |
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pic->reference = 0; |
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/* Make sure our bswap16'd buffer is big enough */ |
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swapped_buf_new = av_fast_realloc(ctx->swapped_buf, |
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&ctx->swapped_buf_size, avpkt->size); |
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if (!swapped_buf_new) { |
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av_log(avctx, AV_LOG_ERROR, "Could not realloc swapped buffer.\n"); |
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return AVERROR(ENOMEM); |
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} |
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ctx->swapped_buf = swapped_buf_new; |
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/* Skip the INFO header if present */ |
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info_offset = 0; |
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info_tag = AV_RL32(src); |
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if (info_tag == MKTAG('I', 'N', 'F', 'O')) { |
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info_offset = AV_RL32(src + 4); |
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if (info_offset > UINT32_MAX - 8 || info_offset + 8 > avpkt->size) { |
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av_log(avctx, AV_LOG_ERROR, |
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"Invalid INFO header offset: 0x%08X is too large.\n", |
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info_offset); |
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return AVERROR_INVALIDDATA; |
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} |
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info_offset += 8; |
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src += info_offset; |
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av_log(avctx, AV_LOG_DEBUG, "Skipping INFO chunk.\n"); |
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} |
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/* bswap16 the buffer since CLLC's bitreader works in 16-bit words */ |
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ctx->dsp.bswap16_buf((uint16_t *) ctx->swapped_buf, (uint16_t *) src, |
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(avpkt->size - info_offset) / 2); |
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init_get_bits(&gb, ctx->swapped_buf, (avpkt->size - info_offset) * 8); |
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/*
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* Read in coding type. The types are as follows: |
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* |
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* 0 - YUY2 |
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* 1 - BGR24 (Triples) |
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* 2 - BGR24 (Quads) |
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* 3 - BGRA |
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*/ |
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coding_type = (AV_RL32(src) >> 8) & 0xFF; |
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av_log(avctx, AV_LOG_DEBUG, "Frame coding type: %d\n", coding_type); |
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switch (coding_type) { |
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case 1: |
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avctx->pix_fmt = PIX_FMT_RGB24; |
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avctx->bits_per_raw_sample = 8; |
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ret = avctx->get_buffer(avctx, pic); |
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if (ret < 0) { |
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av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n"); |
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return ret; |
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} |
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ret = decode_bgr24_frame(ctx, &gb, pic); |
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if (ret < 0) |
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return ret; |
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break; |
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default: |
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av_log(avctx, AV_LOG_ERROR, "Unknown coding type: %d\n.", coding_type); |
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return AVERROR_INVALIDDATA; |
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} |
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pic->key_frame = 1; |
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pic->pict_type = AV_PICTURE_TYPE_I; |
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*got_picture_ptr = 1; |
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*(AVFrame *)data = *pic; |
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return avpkt->size; |
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} |
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static av_cold int cllc_decode_close(AVCodecContext *avctx) |
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{ |
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CLLCContext *ctx = avctx->priv_data; |
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if (avctx->coded_frame->data[0]) |
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avctx->release_buffer(avctx, avctx->coded_frame); |
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av_freep(&avctx->coded_frame); |
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av_freep(&ctx->swapped_buf); |
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return 0; |
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} |
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static av_cold int cllc_decode_init(AVCodecContext *avctx) |
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{ |
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CLLCContext *ctx = avctx->priv_data; |
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/* Initialize various context values */ |
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ctx->avctx = avctx; |
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ctx->swapped_buf = NULL; |
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ctx->swapped_buf_size = 0; |
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ff_dsputil_init(&ctx->dsp, avctx); |
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avctx->coded_frame = avcodec_alloc_frame(); |
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if (!avctx->coded_frame) { |
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av_log(avctx, AV_LOG_ERROR, "Could not allocate frame.\n"); |
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return AVERROR(ENOMEM); |
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} |
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return 0; |
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} |
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AVCodec ff_cllc_decoder = { |
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.name = "cllc", |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = CODEC_ID_CLLC, |
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.priv_data_size = sizeof(CLLCContext), |
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.init = cllc_decode_init, |
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.decode = cllc_decode_frame, |
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.close = cllc_decode_close, |
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.capabilities = CODEC_CAP_DR1, |
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.long_name = NULL_IF_CONFIG_SMALL("Canopus Lossless Codec"), |
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}; |
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