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authorDerek Buitenhuis <derek.buitenhuis@gmail.com>2012-08-01 17:46:53 +0000
committerDerek Buitenhuis <derek.buitenhuis@gmail.com>2012-08-01 22:06:16 -0400
commit45eaac02cbb8eb251945d8769a9c81254969528a (patch)
tree099c280dba6eb618b9ba17d1748decd3cffb5847 /libavcodec/cllc.c
parent19cf7163c1576e7b03ea33d7bf633e14d7516db8 (diff)
downloadffmpeg-45eaac02cbb8eb251945d8769a9c81254969528a.tar.gz
Canopus Lossless decoder
At the moment it only does BGR24, but I plan to add the rest after. Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
Diffstat (limited to 'libavcodec/cllc.c')
-rw-r--r--libavcodec/cllc.c284
1 files changed, 284 insertions, 0 deletions
diff --git a/libavcodec/cllc.c b/libavcodec/cllc.c
new file mode 100644
index 0000000000..aca4669fcb
--- /dev/null
+++ b/libavcodec/cllc.c
@@ -0,0 +1,284 @@
+/*
+ * Canopus Lossless Codec decoder
+ *
+ * Copyright (c) 2012 Derek Buitenhuis
+ *
+ * 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
+ */
+
+#include "libavutil/intreadwrite.h"
+#include "dsputil.h"
+#include "get_bits.h"
+#include "avcodec.h"
+
+typedef struct CLLCContext {
+ DSPContext dsp;
+ AVCodecContext *avctx;
+
+ uint8_t *swapped_buf;
+ int swapped_buf_size;
+} CLLCContext;
+
+static int read_code_table(CLLCContext *ctx, GetBitContext *gb, VLC *vlc)
+{
+ uint8_t symbols[256];
+ uint8_t bits[256];
+ uint16_t codes[256];
+ int num_lens, num_codes, num_codes_sum, prefix;
+ int i, j, count;
+
+ prefix = 0;
+ count = 0;
+ num_codes_sum = 0;
+
+ num_lens = get_bits(gb, 5);
+
+ for (i = 0; i < num_lens; i++) {
+ num_codes = get_bits(gb, 9);
+ num_codes_sum += num_codes;
+
+ if (num_codes_sum > 256) {
+ vlc->table = NULL;
+
+ av_log(ctx->avctx, AV_LOG_ERROR,
+ "Too many VLCs (%d) to be read.\n", num_codes_sum);
+ return AVERROR_INVALIDDATA;
+ }
+
+ for (j = 0; j < num_codes; j++) {
+ symbols[count] = get_bits(gb, 8);
+ bits[count] = i + 1;
+ codes[count] = prefix++;
+
+ count++;
+ }
+
+ prefix <<= 1;
+ }
+
+ return ff_init_vlc_sparse(vlc, 7, count, bits, 1, 1,
+ codes, 2, 2, symbols, 1, 1, 0);
+}
+
+static int read_line(CLLCContext *ctx, GetBitContext *gb, int *top_left,
+ VLC *vlc, uint8_t *outbuf)
+{
+ uint8_t *dst;
+ int pred, code;
+ int i;
+
+ OPEN_READER(bits, gb);
+
+ dst = outbuf;
+ pred = *top_left;
+
+ /* Simultaneously read and restore the line */
+ for (i = 0; i < ctx->avctx->width; i++) {
+ UPDATE_CACHE(bits, gb);
+ GET_VLC(code, bits, gb, vlc->table, 7, 2);
+
+ pred += code;
+ dst[0] = pred;
+ dst += 3;
+ }
+
+ CLOSE_READER(bits, gb);
+
+ /* Stash the first pixel */
+ *top_left = dst[-3 * ctx->avctx->width];
+
+ return 0;
+}
+
+static int decode_bgr24_frame(CLLCContext *ctx, GetBitContext *gb, AVFrame *pic)
+{
+ AVCodecContext *avctx = ctx->avctx;
+ uint8_t *dst;
+ int pred[3];
+ int ret;
+ int i, j;
+ VLC vlc[3];
+
+ pred[0] = 0x80;
+ pred[1] = 0x80;
+ pred[2] = 0x80;
+
+ dst = pic->data[0];
+
+ skip_bits(gb, 16);
+
+ /* Read in code table for each plane */
+ for (i = 0; i < 3; i++) {
+ ret = read_code_table(ctx, gb, &vlc[i]);
+ if (ret < 0) {
+ for (j = 0; j <= i; j++)
+ ff_free_vlc(&vlc[j]);
+
+ av_log(ctx->avctx, AV_LOG_ERROR,
+ "Could not read code table %d.\n", i);
+ return ret;
+ }
+ }
+
+ /* Read in and restore every line */
+ for (i = 0; i < avctx->height; i++) {
+ for (j = 0; j < 3; j++)
+ read_line(ctx, gb, &pred[j], &vlc[j], &dst[j]);
+
+ dst += pic->linesize[0];
+ }
+
+ for (i = 0; i < 3; i++)
+ ff_free_vlc(&vlc[i]);
+
+ return 0;
+}
+
+static int cllc_decode_frame(AVCodecContext *avctx, void *data,
+ int *got_picture_ptr, AVPacket *avpkt)
+{
+ CLLCContext *ctx = avctx->priv_data;
+ AVFrame *pic = avctx->coded_frame;
+ uint8_t *src = avpkt->data;
+ uint8_t *swapped_buf_new;
+ uint32_t info_tag, info_offset;
+ GetBitContext gb;
+ int coding_type, ret;
+
+ if (pic->data[0])
+ avctx->release_buffer(avctx, pic);
+
+ pic->reference = 0;
+
+ /* Make sure our bswap16'd buffer is big enough */
+ swapped_buf_new = av_fast_realloc(ctx->swapped_buf,
+ &ctx->swapped_buf_size, avpkt->size);
+ if (!swapped_buf_new) {
+ av_log(avctx, AV_LOG_ERROR, "Could not realloc swapped buffer.\n");
+ return AVERROR(ENOMEM);
+ }
+ ctx->swapped_buf = swapped_buf_new;
+
+ /* Skip the INFO header if present */
+ info_offset = 0;
+ info_tag = AV_RL32(src);
+ if (info_tag == MKTAG('I', 'N', 'F', 'O')) {
+ info_offset = AV_RL32(src + 4);
+ if (info_offset > UINT32_MAX - 8 || info_offset + 8 > avpkt->size) {
+ av_log(avctx, AV_LOG_ERROR,
+ "Invalid INFO header offset: 0x%08X is too large.\n",
+ info_offset);
+ return AVERROR_INVALIDDATA;
+ }
+
+ info_offset += 8;
+ src += info_offset;
+
+ av_log(avctx, AV_LOG_DEBUG, "Skipping INFO chunk.\n");
+ }
+
+ /* bswap16 the buffer since CLLC's bitreader works in 16-bit words */
+ ctx->dsp.bswap16_buf((uint16_t *) ctx->swapped_buf, (uint16_t *) src,
+ (avpkt->size - info_offset) / 2);
+
+ init_get_bits(&gb, ctx->swapped_buf, (avpkt->size - info_offset) * 8);
+
+ /*
+ * Read in coding type. The types are as follows:
+ *
+ * 0 - YUY2
+ * 1 - BGR24 (Triples)
+ * 2 - BGR24 (Quads)
+ * 3 - BGRA
+ */
+ coding_type = (AV_RL32(src) >> 8) & 0xFF;
+ av_log(avctx, AV_LOG_DEBUG, "Frame coding type: %d\n", coding_type);
+
+ switch (coding_type) {
+ case 1:
+ avctx->pix_fmt = PIX_FMT_RGB24;
+ avctx->bits_per_raw_sample = 8;
+
+ ret = avctx->get_buffer(avctx, pic);
+ if (ret < 0) {
+ av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n");
+ return ret;
+ }
+
+ ret = decode_bgr24_frame(ctx, &gb, pic);
+ if (ret < 0)
+ return ret;
+
+ break;
+ default:
+ av_log(avctx, AV_LOG_ERROR, "Unknown coding type: %d\n.", coding_type);
+ return AVERROR_INVALIDDATA;
+ }
+
+ pic->key_frame = 1;
+ pic->pict_type = AV_PICTURE_TYPE_I;
+
+ *got_picture_ptr = 1;
+ *(AVFrame *)data = *pic;
+
+ return avpkt->size;
+}
+
+static av_cold int cllc_decode_close(AVCodecContext *avctx)
+{
+ CLLCContext *ctx = avctx->priv_data;
+
+ if (avctx->coded_frame->data[0])
+ avctx->release_buffer(avctx, avctx->coded_frame);
+
+ av_freep(&avctx->coded_frame);
+ av_freep(&ctx->swapped_buf);
+
+ return 0;
+}
+
+static av_cold int cllc_decode_init(AVCodecContext *avctx)
+{
+ CLLCContext *ctx = avctx->priv_data;
+
+ /* Initialize various context values */
+ ctx->avctx = avctx;
+ ctx->swapped_buf = NULL;
+ ctx->swapped_buf_size = 0;
+
+ ff_dsputil_init(&ctx->dsp, avctx);
+
+ avctx->coded_frame = avcodec_alloc_frame();
+ if (!avctx->coded_frame) {
+ av_log(avctx, AV_LOG_ERROR, "Could not allocate frame.\n");
+ return AVERROR(ENOMEM);
+ }
+
+ return 0;
+}
+
+AVCodec ff_cllc_decoder = {
+ .name = "cllc",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = CODEC_ID_CLLC,
+ .priv_data_size = sizeof(CLLCContext),
+ .init = cllc_decode_init,
+ .decode = cllc_decode_frame,
+ .close = cllc_decode_close,
+ .capabilities = CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("Canopus Lossless Codec"),
+};