[FFmpeg-devel] [PATCH] Canopus Lossless decoder
Derek Buitenhuis
derek.buitenhuis at gmail.com
Wed Aug 1 19:52:52 CEST 2012
At the moment it only does BGR24, but I plan to add the rest after.
Signed-off-by: Derek Buitenhuis <derek.buitenhuis at gmail.com>
---
Changelog | 1 +
MAINTAINERS | 1 +
doc/general.texi | 1 +
libavcodec/Makefile | 1 +
libavcodec/allcodecs.c | 1 +
libavcodec/avcodec.h | 1 +
libavcodec/cllc.c | 279 ++++++++++++++++++++++++++++++++++++++++++++++++
libavcodec/version.h | 2 +-
libavformat/riff.c | 1 +
9 files changed, 287 insertions(+), 1 deletion(-)
create mode 100644 libavcodec/cllc.c
diff --git a/Changelog b/Changelog
index 79a8f4c..813116a 100644
--- a/Changelog
+++ b/Changelog
@@ -38,6 +38,7 @@ version next:
- alphaextract and alphamerge filters
- concat filter
- flite filter
+- Canopus Lossless Codec decoder
version 0.11:
diff --git a/MAINTAINERS b/MAINTAINERS
index 1a9f29b..f265907 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -132,6 +132,7 @@ Codecs:
celp_filters.* Vitor Sessak
cinepak.c Roberto Togni
cljr Alex Beregszaszi
+ cllc.c Derek Buitenhuis
cook.c, cookdata.h Benjamin Larsson
crystalhd.c Philip Langdale
cscd.c Reimar Doeffinger
diff --git a/doc/general.texi b/doc/general.texi
index 5776a77..29a0aa1 100644
--- a/doc/general.texi
+++ b/doc/general.texi
@@ -501,6 +501,7 @@ following image formats are supported:
@item Delphine Software International CIN video @tab @tab X
@tab Codec used in Delphine Software International games.
@item Discworld II BMV Video @tab @tab X
+ at item Canopus Lossless Codec @tab @tab X
@item Cinepak @tab @tab X
@item Cirrus Logic AccuPak @tab X @tab X
@tab fourcc: CLJR
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index b4138e8..bb9aa9a 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -131,6 +131,7 @@ OBJS-$(CONFIG_CDXL_DECODER) += cdxl.o
OBJS-$(CONFIG_CINEPAK_DECODER) += cinepak.o
OBJS-$(CONFIG_CLJR_DECODER) += cljr.o
OBJS-$(CONFIG_CLJR_ENCODER) += cljr.o
+OBJS-$(CONFIG_CLLC_DECODER) += cllc.o
OBJS-$(CONFIG_COOK_DECODER) += cook.o
OBJS-$(CONFIG_CSCD_DECODER) += cscd.o
OBJS-$(CONFIG_CYUV_DECODER) += cyuv.o
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index 6bcc3c2..43c6c16 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -94,6 +94,7 @@ void avcodec_register_all(void)
REGISTER_DECODER (CDXL, cdxl);
REGISTER_DECODER (CINEPAK, cinepak);
REGISTER_ENCDEC (CLJR, cljr);
+ REGISTER_DECODER (CLLC, cllc);
REGISTER_DECODER (CSCD, cscd);
REGISTER_DECODER (CYUV, cyuv);
REGISTER_DECODER (DFA, dfa);
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index fb16c83..7a7400d 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -274,6 +274,7 @@ enum CodecID {
CODEC_ID_YUV4 = MKBETAG('Y','U','V','4'),
CODEC_ID_SANM = MKBETAG('S','A','N','M'),
CODEC_ID_PAF_VIDEO = MKBETAG('P','A','F','V'),
+ CODEC_ID_CLLC = MKBETAG('C','L','L','C'),
/* various PCM "codecs" */
CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
diff --git a/libavcodec/cllc.c b/libavcodec/cllc.c
new file mode 100644
index 0000000..6fb5455
--- /dev/null
+++ b/libavcodec/cllc.c
@@ -0,0 +1,279 @@
+/*
+ * Canopus Lossless Codec decoder
+ *
+ * Copyright (c) 2012 Derek Buitenhuis
+ *
+ * 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 "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, prefix;
+ int i, j, count;
+
+ prefix = 0;
+ count = 0;
+
+ num_lens = get_bits(gb, 5);
+
+ for (i = 0; i < num_lens; i++) {
+ num_codes = get_bits(gb, 9);
+
+ 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;
+
+ /* Simultaniously 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) {
+ 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 > avpkt->size - 8) {
+ 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;
+
+ if (avctx->get_buffer(avctx, pic) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n");
+ return AVERROR(ENOMEM);
+ }
+
+ 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);
+
+ if (avctx->coded_frame)
+ av_freep(&avctx->coded_frame);
+
+ if (ctx->swapped_buf)
+ av_freep(&ctx->swapped_buf);
+
+ return 0;
+}
+
+static av_cold int cllc_decode_init(AVCodecContext *avctx)
+{
+ CLLCContext *ctx = avctx->priv_data;
+
+ /* Stash for later use */
+ ctx->avctx = avctx;
+
+ 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);
+ }
+
+ ctx->swapped_buf = av_malloc(avctx->width * avctx->height * 3);
+ if (!ctx->swapped_buf) {
+ cllc_decode_close(avctx);
+ av_log(avctx, AV_LOG_ERROR,
+ "Could not allocate swapped buffer 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"),
+};
diff --git a/libavcodec/version.h b/libavcodec/version.h
index 6cef037..48096ec 100644
--- a/libavcodec/version.h
+++ b/libavcodec/version.h
@@ -27,7 +27,7 @@
*/
#define LIBAVCODEC_VERSION_MAJOR 54
-#define LIBAVCODEC_VERSION_MINOR 46
+#define LIBAVCODEC_VERSION_MINOR 47
#define LIBAVCODEC_VERSION_MICRO 100
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
diff --git a/libavformat/riff.c b/libavformat/riff.c
index 04419ed..bf14c45 100644
--- a/libavformat/riff.c
+++ b/libavformat/riff.c
@@ -315,6 +315,7 @@ const AVCodecTag ff_codec_bmp_tags[] = {
{ CODEC_ID_MSA1, MKTAG('M', 'S', 'A', '1') },
{ CODEC_ID_TSCC2, MKTAG('T', 'S', 'C', '2') },
{ CODEC_ID_MTS2, MKTAG('M', 'T', 'S', '2') },
+ { CODEC_ID_CLLC, MKTAG('C', 'L', 'L', 'C') },
{ CODEC_ID_NONE, 0 }
};
--
1.7.10.4
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