* Sierra VMD Audio & Video Decoders
* Copyright (C) 2004 the ffmpeg project
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * 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.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * 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 FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
*/
/**
- * @file vmdvideo.c
+ * @file
* Sierra VMD audio & video decoders
* by Vladimir "VAG" Gneushev (vagsoft at mail.ru)
* for more information on the Sierra VMD format, visit:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <unistd.h>
+#include "libavutil/intreadwrite.h"
#include "avcodec.h"
-#include "dsputil.h"
#define VMD_HEADER_SIZE 0x330
#define PALETTE_COUNT 256
typedef struct VmdVideoContext {
AVCodecContext *avctx;
- DSPContext dsp;
AVFrame frame;
AVFrame prev_frame;
- unsigned char *buf;
+ const unsigned char *buf;
int size;
unsigned char palette[PALETTE_COUNT * 4];
unsigned char *unpack_buffer;
int unpack_buffer_size;
+ int x_off, y_off;
} VmdVideoContext;
#define QUEUE_SIZE 0x1000
#define QUEUE_MASK 0x0FFF
-static void lz_unpack(unsigned char *src, unsigned char *dest, int dest_len)
+static void lz_unpack(const unsigned char *src, unsigned char *dest, int dest_len)
{
- unsigned char *s;
+ const unsigned char *s;
unsigned char *d;
unsigned char *d_end;
unsigned char queue[QUEUE_SIZE];
}
}
-static int rle_unpack(unsigned char *src, unsigned char *dest,
+static int rle_unpack(const unsigned char *src, unsigned char *dest,
int src_len, int dest_len)
{
- unsigned char *ps;
+ const unsigned char *ps;
unsigned char *pd;
int i, l;
unsigned char *dest_end = dest + dest_len;
if (l & 0x80) {
l = (l & 0x7F) * 2;
if (pd + l > dest_end)
- return (ps - src);
+ return ps - src;
memcpy(pd, ps, l);
ps += l;
pd += l;
} else {
if (pd + i > dest_end)
- return (ps - src);
+ return ps - src;
for (i = 0; i < l; i++) {
*pd++ = ps[0];
*pd++ = ps[1];
i += l;
} while (i < src_len);
- return (ps - src);
+ return ps - src;
}
static void vmd_decode(VmdVideoContext *s)
unsigned char r, g, b;
/* point to the start of the encoded data */
- unsigned char *p = s->buf + 16;
+ const unsigned char *p = s->buf + 16;
- unsigned char *pb;
+ const unsigned char *pb;
unsigned char meth;
unsigned char *dp; /* pointer to current frame */
unsigned char *pp; /* pointer to previous frame */
int frame_x, frame_y;
int frame_width, frame_height;
- int dp_size;
frame_x = AV_RL16(&s->buf[6]);
frame_y = AV_RL16(&s->buf[8]);
frame_width = AV_RL16(&s->buf[10]) - frame_x + 1;
frame_height = AV_RL16(&s->buf[12]) - frame_y + 1;
+ if ((frame_width == s->avctx->width && frame_height == s->avctx->height) &&
+ (frame_x || frame_y)) {
+
+ s->x_off = frame_x;
+ s->y_off = frame_y;
+ }
+ frame_x -= s->x_off;
+ frame_y -= s->y_off;
+
/* if only a certain region will be updated, copy the entire previous
* frame before the decode */
if (frame_x || frame_y || (frame_width != s->avctx->width) ||
}
dp = &s->frame.data[0][frame_y * s->frame.linesize[0] + frame_x];
- dp_size = s->frame.linesize[0] * s->avctx->height;
pp = &s->prev_frame.data[0][frame_y * s->prev_frame.linesize[0] + frame_x];
switch (meth) {
case 1:
}
}
-static int vmdvideo_decode_init(AVCodecContext *avctx)
+static av_cold int vmdvideo_decode_init(AVCodecContext *avctx)
{
VmdVideoContext *s = avctx->priv_data;
int i;
s->avctx = avctx;
avctx->pix_fmt = PIX_FMT_PAL8;
- dsputil_init(&s->dsp, avctx);
/* make sure the VMD header made it */
if (s->avctx->extradata_size != VMD_HEADER_SIZE) {
palette32[i] = (r << 16) | (g << 8) | (b);
}
- s->frame.data[0] = s->prev_frame.data[0] = NULL;
-
return 0;
}
static int vmdvideo_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
- uint8_t *buf, int buf_size)
+ AVPacket *avpkt)
{
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
VmdVideoContext *s = avctx->priv_data;
s->buf = buf;
/* make the palette available on the way out */
memcpy(s->frame.data[1], s->palette, PALETTE_COUNT * 4);
- if (s->prev_frame.data[0])
- avctx->release_buffer(avctx, &s->prev_frame);
-
/* shuffle frames */
- s->prev_frame = s->frame;
+ FFSWAP(AVFrame, s->frame, s->prev_frame);
+ if (s->frame.data[0])
+ avctx->release_buffer(avctx, &s->frame);
*data_size = sizeof(AVFrame);
- *(AVFrame*)data = s->frame;
+ *(AVFrame*)data = s->prev_frame;
/* report that the buffer was completely consumed */
return buf_size;
}
-static int vmdvideo_decode_end(AVCodecContext *avctx)
+static av_cold int vmdvideo_decode_end(AVCodecContext *avctx)
{
VmdVideoContext *s = avctx->priv_data;
* Audio Decoder
*/
+#define BLOCK_TYPE_AUDIO 1
+#define BLOCK_TYPE_INITIAL 2
+#define BLOCK_TYPE_SILENCE 3
+
typedef struct VmdAudioContext {
AVCodecContext *avctx;
- int channels;
- int bits;
- int block_align;
+ int out_bps;
int predictors[2];
} VmdAudioContext;
-static uint16_t vmdaudio_table[128] = {
+static const uint16_t vmdaudio_table[128] = {
0x000, 0x008, 0x010, 0x020, 0x030, 0x040, 0x050, 0x060, 0x070, 0x080,
0x090, 0x0A0, 0x0B0, 0x0C0, 0x0D0, 0x0E0, 0x0F0, 0x100, 0x110, 0x120,
0x130, 0x140, 0x150, 0x160, 0x170, 0x180, 0x190, 0x1A0, 0x1B0, 0x1C0,
0xF00, 0x1000, 0x1400, 0x1800, 0x1C00, 0x2000, 0x3000, 0x4000
};
-static int vmdaudio_decode_init(AVCodecContext *avctx)
+static av_cold int vmdaudio_decode_init(AVCodecContext *avctx)
{
VmdAudioContext *s = avctx->priv_data;
s->avctx = avctx;
- s->channels = avctx->channels;
- s->bits = avctx->bits_per_sample;
- s->block_align = avctx->block_align;
+ if (avctx->bits_per_coded_sample == 16)
+ avctx->sample_fmt = AV_SAMPLE_FMT_S16;
+ else
+ avctx->sample_fmt = AV_SAMPLE_FMT_U8;
+ s->out_bps = av_get_bytes_per_sample(avctx->sample_fmt);
- av_log(s->avctx, AV_LOG_DEBUG, "%d channels, %d bits/sample, block align = %d, sample rate = %d\n",
- s->channels, s->bits, s->block_align, avctx->sample_rate);
+ av_log(avctx, AV_LOG_DEBUG, "%d channels, %d bits/sample, "
+ "block align = %d, sample rate = %d\n",
+ avctx->channels, avctx->bits_per_coded_sample, avctx->block_align,
+ avctx->sample_rate);
return 0;
}
static void vmdaudio_decode_audio(VmdAudioContext *s, unsigned char *data,
- uint8_t *buf, int stereo)
+ const uint8_t *buf, int buf_size, int stereo)
{
int i;
int chan = 0;
int16_t *out = (int16_t*)data;
- for(i = 0; i < s->block_align; i++) {
+ for(i = 0; i < buf_size; i++) {
if(buf[i] & 0x80)
s->predictors[chan] -= vmdaudio_table[buf[i] & 0x7F];
else
s->predictors[chan] += vmdaudio_table[buf[i]];
- s->predictors[chan] = av_clip(s->predictors[chan], -32768, 32767);
+ s->predictors[chan] = av_clip_int16(s->predictors[chan]);
out[i] = s->predictors[chan];
chan ^= stereo;
}
}
static int vmdaudio_loadsound(VmdAudioContext *s, unsigned char *data,
- uint8_t *buf, int silence)
+ const uint8_t *buf, int silent_chunks, int data_size)
{
- int bytes_decoded = 0;
- int i;
+ int silent_size = s->avctx->block_align * silent_chunks * s->out_bps;
-// if (silence)
-// av_log(s->avctx, AV_LOG_INFO, "silent block!\n");
- if (s->channels == 2) {
-
- /* stereo handling */
- if (silence) {
- memset(data, 0, s->block_align * 2);
- } else {
- if (s->bits == 16)
- vmdaudio_decode_audio(s, data, buf, 1);
- else {
- /* copy the data but convert it to signed */
- for (i = 0; i < s->block_align; i++){
- *data++ = buf[i] + 0x80;
- *data++ = buf[i] + 0x80;
- }
- }
- }
- } else {
- bytes_decoded = s->block_align * 2;
-
- /* mono handling */
- if (silence) {
- memset(data, 0, s->block_align * 2);
- } else {
- if (s->bits == 16) {
- vmdaudio_decode_audio(s, data, buf, 0);
- } else {
- /* copy the data but convert it to signed */
- for (i = 0; i < s->block_align; i++){
- *data++ = buf[i] + 0x80;
- *data++ = buf[i] + 0x80;
- }
- }
- }
+ if (silent_chunks) {
+ memset(data, s->out_bps == 2 ? 0x00 : 0x80, silent_size);
+ data += silent_size;
+ }
+ if (s->avctx->bits_per_coded_sample == 16)
+ vmdaudio_decode_audio(s, data, buf, data_size, s->avctx->channels == 2);
+ else {
+ /* just copy the data */
+ memcpy(data, buf, data_size);
}
- return s->block_align * 2;
+ return silent_size + data_size * s->out_bps;
}
static int vmdaudio_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
- uint8_t *buf, int buf_size)
+ AVPacket *avpkt)
{
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
VmdAudioContext *s = avctx->priv_data;
+ int block_type, silent_chunks;
unsigned char *output_samples = (unsigned char *)data;
- /* point to the start of the encoded data */
- unsigned char *p = buf + 16;
-
- if (buf_size < 16)
+ if (buf_size < 16) {
+ av_log(avctx, AV_LOG_WARNING, "skipping small junk packet\n");
+ *data_size = 0;
return buf_size;
+ }
- if (buf[6] == 1) {
- /* the chunk contains audio */
- *data_size = vmdaudio_loadsound(s, output_samples, p, 0);
- } else if (buf[6] == 2) {
- /* the chunk may contain audio */
- p += 4;
- *data_size = vmdaudio_loadsound(s, output_samples, p, (buf_size == 16));
- output_samples += (s->block_align * s->bits / 8);
- } else if (buf[6] == 3) {
- /* silent chunk */
- *data_size = vmdaudio_loadsound(s, output_samples, p, 1);
+ block_type = buf[6];
+ if (block_type < BLOCK_TYPE_AUDIO || block_type > BLOCK_TYPE_SILENCE) {
+ av_log(avctx, AV_LOG_ERROR, "unknown block type: %d\n", block_type);
+ return AVERROR(EINVAL);
+ }
+ buf += 16;
+ buf_size -= 16;
+
+ silent_chunks = 0;
+ if (block_type == BLOCK_TYPE_INITIAL) {
+ uint32_t flags = AV_RB32(buf);
+ silent_chunks = av_popcount(flags);
+ buf += 4;
+ buf_size -= 4;
+ } else if (block_type == BLOCK_TYPE_SILENCE) {
+ silent_chunks = 1;
+ buf_size = 0; // should already be zero but set it just to be sure
}
- return buf_size;
+ /* ensure output buffer is large enough */
+ if (*data_size < (avctx->block_align*silent_chunks + buf_size) * s->out_bps)
+ return -1;
+
+ *data_size = vmdaudio_loadsound(s, output_samples, buf, silent_chunks, buf_size);
+
+ return avpkt->size;
}
* Public Data Structures
*/
-AVCodec vmdvideo_decoder = {
+AVCodec ff_vmdvideo_decoder = {
"vmdvideo",
- CODEC_TYPE_VIDEO,
+ AVMEDIA_TYPE_VIDEO,
CODEC_ID_VMDVIDEO,
sizeof(VmdVideoContext),
vmdvideo_decode_init,
vmdvideo_decode_end,
vmdvideo_decode_frame,
CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("Sierra VMD video"),
};
-AVCodec vmdaudio_decoder = {
+AVCodec ff_vmdaudio_decoder = {
"vmdaudio",
- CODEC_TYPE_AUDIO,
+ AVMEDIA_TYPE_AUDIO,
CODEC_ID_VMDAUDIO,
sizeof(VmdAudioContext),
vmdaudio_decode_init,
NULL,
NULL,
vmdaudio_decode_frame,
+ .long_name = NULL_IF_CONFIG_SMALL("Sierra VMD audio"),
};
projects / ffmpeg / blobdiff