[FFmpeg-cvslog] bmv: Split audio and video decoder
Nidhi Makhijani
git at videolan.org
Mon Jul 7 00:01:00 CEST 2014
ffmpeg | branch: master | Nidhi Makhijani <nidhimj22 at gmail.com> | Sun Jul 6 19:51:49 2014 +0530| [2fc85fe96e7e0e5fc433b98eacebf4d3511d2d58] | committer: Diego Biurrun
bmv: Split audio and video decoder
Signed-off-by: Diego Biurrun <diego at biurrun.de>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=2fc85fe96e7e0e5fc433b98eacebf4d3511d2d58
---
libavcodec/Makefile | 4 +-
libavcodec/bmvaudio.c | 91 ++++++++++++++++++++++++++++++++++++++
libavcodec/{bmv.c => bmvvideo.c} | 70 ++---------------------------
3 files changed, 96 insertions(+), 69 deletions(-)
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 6779d9a..0440b94 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -132,8 +132,8 @@ OBJS-$(CONFIG_BINKAUDIO_DCT_DECODER) += binkaudio.o wma.o wma_common.o
OBJS-$(CONFIG_BINKAUDIO_RDFT_DECODER) += binkaudio.o wma.o wma_common.o
OBJS-$(CONFIG_BMP_DECODER) += bmp.o msrledec.o
OBJS-$(CONFIG_BMP_ENCODER) += bmpenc.o
-OBJS-$(CONFIG_BMV_VIDEO_DECODER) += bmv.o
-OBJS-$(CONFIG_BMV_AUDIO_DECODER) += bmv.o
+OBJS-$(CONFIG_BMV_AUDIO_DECODER) += bmvaudio.o
+OBJS-$(CONFIG_BMV_VIDEO_DECODER) += bmvvideo.o
OBJS-$(CONFIG_BRENDER_PIX_DECODER) += brenderpix.o
OBJS-$(CONFIG_C93_DECODER) += c93.o
OBJS-$(CONFIG_CAVS_DECODER) += cavs.o cavsdec.o cavsdsp.o \
diff --git a/libavcodec/bmvaudio.c b/libavcodec/bmvaudio.c
new file mode 100644
index 0000000..0f8c224
--- /dev/null
+++ b/libavcodec/bmvaudio.c
@@ -0,0 +1,91 @@
+/*
+ * Discworld II BMV audio decoder
+ * Copyright (c) 2011 Konstantin Shishkov
+ *
+ * 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/channel_layout.h"
+#include "libavutil/common.h"
+
+#include "avcodec.h"
+#include "internal.h"
+
+static const int bmv_aud_mults[16] = {
+ 16512, 8256, 4128, 2064, 1032, 516, 258, 192, 129, 88, 64, 56, 48, 40, 36, 32
+};
+
+static av_cold int bmv_aud_decode_init(AVCodecContext *avctx)
+{
+ avctx->channels = 2;
+ avctx->channel_layout = AV_CH_LAYOUT_STEREO;
+ avctx->sample_fmt = AV_SAMPLE_FMT_S16;
+
+ return 0;
+}
+
+static int bmv_aud_decode_frame(AVCodecContext *avctx, void *data,
+ int *got_frame_ptr, AVPacket *avpkt)
+{
+ AVFrame *frame = data;
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
+ int blocks = 0, total_blocks, i;
+ int ret;
+ int16_t *output_samples;
+ int scale[2];
+
+ total_blocks = *buf++;
+ if (buf_size < total_blocks * 65 + 1) {
+ av_log(avctx, AV_LOG_ERROR, "expected %d bytes, got %d\n",
+ total_blocks * 65 + 1, buf_size);
+ return AVERROR_INVALIDDATA;
+ }
+
+ /* get output buffer */
+ frame->nb_samples = total_blocks * 32;
+ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ return ret;
+ }
+ output_samples = (int16_t *)frame->data[0];
+
+ for (blocks = 0; blocks < total_blocks; blocks++) {
+ uint8_t code = *buf++;
+ code = (code >> 1) | (code << 7);
+ scale[0] = bmv_aud_mults[code & 0xF];
+ scale[1] = bmv_aud_mults[code >> 4];
+ for (i = 0; i < 32; i++) {
+ *output_samples++ = av_clip_int16((scale[0] * (int8_t)*buf++) >> 5);
+ *output_samples++ = av_clip_int16((scale[1] * (int8_t)*buf++) >> 5);
+ }
+ }
+
+ *got_frame_ptr = 1;
+
+ return buf_size;
+}
+
+AVCodec ff_bmv_audio_decoder = {
+ .name = "bmv_audio",
+ .long_name = NULL_IF_CONFIG_SMALL("Discworld II BMV audio"),
+ .type = AVMEDIA_TYPE_AUDIO,
+ .id = AV_CODEC_ID_BMV_AUDIO,
+ .init = bmv_aud_decode_init,
+ .decode = bmv_aud_decode_frame,
+ .capabilities = CODEC_CAP_DR1,
+};
diff --git a/libavcodec/bmv.c b/libavcodec/bmvvideo.c
similarity index 81%
rename from libavcodec/bmv.c
rename to libavcodec/bmvvideo.c
index 3c017d0..ebc8e7a 100644
--- a/libavcodec/bmv.c
+++ b/libavcodec/bmvvideo.c
@@ -1,5 +1,5 @@
/*
- * Discworld II BMV video and audio decoder
+ * Discworld II BMV video decoder
* Copyright (c) 2011 Konstantin Shishkov
*
* This file is part of Libav.
@@ -19,7 +19,8 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#include "libavutil/channel_layout.h"
+#include "libavutil/common.h"
+
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"
@@ -280,61 +281,6 @@ static av_cold int decode_init(AVCodecContext *avctx)
return 0;
}
-static const int bmv_aud_mults[16] = {
- 16512, 8256, 4128, 2064, 1032, 516, 258, 192, 129, 88, 64, 56, 48, 40, 36, 32
-};
-
-static av_cold int bmv_aud_decode_init(AVCodecContext *avctx)
-{
- avctx->channels = 2;
- avctx->channel_layout = AV_CH_LAYOUT_STEREO;
- avctx->sample_fmt = AV_SAMPLE_FMT_S16;
-
- return 0;
-}
-
-static int bmv_aud_decode_frame(AVCodecContext *avctx, void *data,
- int *got_frame_ptr, AVPacket *avpkt)
-{
- AVFrame *frame = data;
- const uint8_t *buf = avpkt->data;
- int buf_size = avpkt->size;
- int blocks = 0, total_blocks, i;
- int ret;
- int16_t *output_samples;
- int scale[2];
-
- total_blocks = *buf++;
- if (buf_size < total_blocks * 65 + 1) {
- av_log(avctx, AV_LOG_ERROR, "expected %d bytes, got %d\n",
- total_blocks * 65 + 1, buf_size);
- return AVERROR_INVALIDDATA;
- }
-
- /* get output buffer */
- frame->nb_samples = total_blocks * 32;
- if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
- av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
- return ret;
- }
- output_samples = (int16_t *)frame->data[0];
-
- for (blocks = 0; blocks < total_blocks; blocks++) {
- uint8_t code = *buf++;
- code = (code >> 1) | (code << 7);
- scale[0] = bmv_aud_mults[code & 0xF];
- scale[1] = bmv_aud_mults[code >> 4];
- for (i = 0; i < 32; i++) {
- *output_samples++ = av_clip_int16((scale[0] * (int8_t)*buf++) >> 5);
- *output_samples++ = av_clip_int16((scale[1] * (int8_t)*buf++) >> 5);
- }
- }
-
- *got_frame_ptr = 1;
-
- return buf_size;
-}
-
AVCodec ff_bmv_video_decoder = {
.name = "bmv_video",
.long_name = NULL_IF_CONFIG_SMALL("Discworld II BMV video"),
@@ -345,13 +291,3 @@ AVCodec ff_bmv_video_decoder = {
.decode = decode_frame,
.capabilities = CODEC_CAP_DR1,
};
-
-AVCodec ff_bmv_audio_decoder = {
- .name = "bmv_audio",
- .long_name = NULL_IF_CONFIG_SMALL("Discworld II BMV audio"),
- .type = AVMEDIA_TYPE_AUDIO,
- .id = AV_CODEC_ID_BMV_AUDIO,
- .init = bmv_aud_decode_init,
- .decode = bmv_aud_decode_frame,
- .capabilities = CODEC_CAP_DR1,
-};
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