mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-29 10:52:20 +00:00
1ec94b0f06
Coccinelle profile used:
@@
expression r, ctx, f, loglevel, str, flags;
@@
-if ((r = ff_get_buffer(ctx, f, flags)) < 0) {
- av_log(ctx, loglevel, str);
- return r;
-}
+if ((r = ff_get_buffer(ctx, f, flags)) < 0)
+ return r;
@@
expression r, ctx, f, loglevel, str;
@@
-if ((r = ff_reget_buffer(ctx, f)) < 0) {
- av_log(ctx, loglevel, str);
- return r;
-}
+if ((r = ff_reget_buffer(ctx, f)) < 0)
+ return r;
@@
expression r, ctx, f, loglevel, str, flags;
@@
-if ((r = ff_thread_get_buffer(ctx, f, flags)) < 0) {
- av_log(ctx, loglevel, str);
- return r;
-}
+if ((r = ff_thread_get_buffer(ctx, f, flags)) < 0)
+ return r;
...along with some manual patches for the remaining ones.
399 lines
9.8 KiB
C
399 lines
9.8 KiB
C
/*
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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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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#include "internal.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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/*
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* Unlike the RGB24 read/restore, which reads in a component at a time,
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* ARGB read/restore reads in ARGB quads.
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*/
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static int read_argb_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[4];
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int 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[0] = top_left[0];
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pred[1] = top_left[1];
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pred[2] = top_left[2];
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pred[3] = top_left[3];
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for (i = 0; i < ctx->avctx->width; i++) {
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/* Always get the alpha component */
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UPDATE_CACHE(bits, gb);
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GET_VLC(code, bits, gb, vlc[0].table, 7, 2);
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pred[0] += code;
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dst[0] = pred[0];
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/* Skip the components if they are entirely transparent */
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if (dst[0]) {
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/* Red */
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UPDATE_CACHE(bits, gb);
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GET_VLC(code, bits, gb, vlc[1].table, 7, 2);
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pred[1] += code;
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dst[1] = pred[1];
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/* Green */
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UPDATE_CACHE(bits, gb);
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GET_VLC(code, bits, gb, vlc[2].table, 7, 2);
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pred[2] += code;
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dst[2] = pred[2];
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/* Blue */
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UPDATE_CACHE(bits, gb);
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GET_VLC(code, bits, gb, vlc[3].table, 7, 2);
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pred[3] += code;
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dst[3] = pred[3];
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} else {
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dst[1] = 0;
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dst[2] = 0;
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dst[3] = 0;
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}
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dst += 4;
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}
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CLOSE_READER(bits, gb);
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dst -= 4 * ctx->avctx->width;
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top_left[0] = dst[0];
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/* Only stash components if they are not transparent */
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if (top_left[0]) {
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top_left[1] = dst[1];
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top_left[2] = dst[2];
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top_left[3] = dst[3];
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}
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return 0;
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}
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static int read_rgb24_component_line(CLLCContext *ctx, GetBitContext *gb,
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int *top_left, 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_argb_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[4];
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int ret;
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int i, j;
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VLC vlc[4];
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pred[0] = 0;
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pred[1] = 0x80;
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pred[2] = 0x80;
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pred[3] = 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 < 4; 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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read_argb_line(ctx, gb, pred, vlc, dst);
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dst += pic->linesize[0];
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}
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for (i = 0; i < 4; 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 decode_rgb24_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_rgb24_component_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 = data;
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uint8_t *src = avpkt->data;
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uint32_t info_tag, info_offset;
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int data_size;
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GetBitContext gb;
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int coding_type, ret;
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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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data_size = (avpkt->size - info_offset) & ~1;
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/* Make sure our bswap16'd buffer is big enough */
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av_fast_padded_malloc(&ctx->swapped_buf,
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&ctx->swapped_buf_size, data_size);
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if (!ctx->swapped_buf) {
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av_log(avctx, AV_LOG_ERROR, "Could not allocate swapped buffer.\n");
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return AVERROR(ENOMEM);
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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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data_size / 2);
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init_get_bits(&gb, ctx->swapped_buf, data_size * 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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case 2:
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avctx->pix_fmt = AV_PIX_FMT_RGB24;
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avctx->bits_per_raw_sample = 8;
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if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
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return ret;
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ret = decode_rgb24_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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case 3:
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avctx->pix_fmt = AV_PIX_FMT_ARGB;
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avctx->bits_per_raw_sample = 8;
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if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
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return ret;
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ret = decode_argb_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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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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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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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 = AV_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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