* 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
- *
*/
/**
- * @file vmdvideo.c
+ * @file libavcodec/vmdav.c
* 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 "common.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];
s = src;
d = dest;
d_end = d + dest_len;
- dataleft = LE_32(s);
+ dataleft = AV_RL32(s);
s += 4;
memset(queue, 0x20, QUEUE_SIZE);
- if (LE_32(s) == 0x56781234) {
+ if (AV_RL32(s) == 0x56781234) {
s += 4;
qpos = 0x111;
speclen = 0xF + 3;
}
}
-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_width, frame_height;
int dp_size;
- frame_x = LE_16(&s->buf[6]);
- frame_y = LE_16(&s->buf[8]);
- frame_width = LE_16(&s->buf[10]) - frame_x + 1;
- frame_height = LE_16(&s->buf[12]) - frame_y + 1;
+ 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 */
}
}
-static int vmdvideo_decode_init(AVCodecContext *avctx)
+static av_cold int vmdvideo_decode_init(AVCodecContext *avctx)
{
- VmdVideoContext *s = (VmdVideoContext *)avctx->priv_data;
+ VmdVideoContext *s = avctx->priv_data;
int i;
unsigned int *palette32;
int palette_index = 0;
s->avctx = avctx;
avctx->pix_fmt = PIX_FMT_PAL8;
- avctx->has_b_frames = 0;
- dsputil_init(&s->dsp, avctx);
/* make sure the VMD header made it */
if (s->avctx->extradata_size != VMD_HEADER_SIZE) {
}
vmd_header = (unsigned char *)avctx->extradata;
- s->unpack_buffer_size = LE_32(&vmd_header[800]);
+ s->unpack_buffer_size = AV_RL32(&vmd_header[800]);
s->unpack_buffer = av_malloc(s->unpack_buffer_size);
if (!s->unpack_buffer)
return -1;
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)
{
- VmdVideoContext *s = (VmdVideoContext *)avctx->priv_data;
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
+ VmdVideoContext *s = avctx->priv_data;
s->buf = buf;
s->size = buf_size;
/* 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 = (VmdVideoContext *)avctx->priv_data;
+ VmdVideoContext *s = avctx->priv_data;
if (s->prev_frame.data[0])
avctx->release_buffer(avctx, &s->prev_frame);
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 = (VmdAudioContext *)avctx->priv_data;
+ VmdAudioContext *s = avctx->priv_data;
s->avctx = avctx;
s->channels = avctx->channels;
- s->bits = avctx->bits_per_sample;
+ s->bits = avctx->bits_per_coded_sample;
s->block_align = avctx->block_align;
+ avctx->sample_fmt = SAMPLE_FMT_S16;
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);
}
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] = 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 silence, int data_size)
{
int bytes_decoded = 0;
int i;
/* stereo handling */
if (silence) {
- memset(data, 0, s->block_align * 2);
+ memset(data, 0, data_size * 2);
} else {
if (s->bits == 16)
- vmdaudio_decode_audio(s, data, buf, 1);
+ vmdaudio_decode_audio(s, data, buf, data_size, 1);
else {
/* copy the data but convert it to signed */
- for (i = 0; i < s->block_align; i++){
+ for (i = 0; i < data_size; i++){
*data++ = buf[i] + 0x80;
*data++ = buf[i] + 0x80;
}
}
}
} else {
- bytes_decoded = s->block_align * 2;
+ bytes_decoded = data_size * 2;
/* mono handling */
if (silence) {
- memset(data, 0, s->block_align * 2);
+ memset(data, 0, data_size * 2);
} else {
if (s->bits == 16) {
- vmdaudio_decode_audio(s, data, buf, 0);
+ vmdaudio_decode_audio(s, data, buf, data_size, 0);
} else {
/* copy the data but convert it to signed */
- for (i = 0; i < s->block_align; i++){
+ for (i = 0; i < data_size; i++){
*data++ = buf[i] + 0x80;
*data++ = buf[i] + 0x80;
}
}
}
- return s->block_align * 2;
+ return data_size * 2;
}
static int vmdaudio_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
- uint8_t *buf, int buf_size)
+ AVPacket *avpkt)
{
- VmdAudioContext *s = (VmdAudioContext *)avctx->priv_data;
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
+ VmdAudioContext *s = avctx->priv_data;
unsigned char *output_samples = (unsigned char *)data;
/* point to the start of the encoded data */
- unsigned char *p = buf + 16;
+ const unsigned char *p = buf + 16;
if (buf_size < 16)
return buf_size;
if (buf[6] == 1) {
/* the chunk contains audio */
- *data_size = vmdaudio_loadsound(s, output_samples, p, 0);
+ *data_size = vmdaudio_loadsound(s, output_samples, p, 0, buf_size - 16);
} 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);
+ /* initial chunk, may contain audio and silence */
+ uint32_t flags = AV_RB32(p);
+ int raw_block_size = s->block_align * s->bits / 8;
+ int silent_chunks;
+ if(flags == 0xFFFFFFFF)
+ silent_chunks = 32;
+ else
+ silent_chunks = av_log2(flags + 1);
+ if(*data_size < (s->block_align*silent_chunks + buf_size - 20) * 2)
+ return -1;
+ *data_size = 0;
+ memset(output_samples, 0, raw_block_size * silent_chunks);
+ output_samples += raw_block_size * silent_chunks;
+ *data_size = raw_block_size * silent_chunks;
+ *data_size += vmdaudio_loadsound(s, output_samples, p + 4, 0, buf_size - 20);
} else if (buf[6] == 3) {
/* silent chunk */
- *data_size = vmdaudio_loadsound(s, output_samples, p, 1);
+ *data_size = vmdaudio_loadsound(s, output_samples, p, 1, 0);
}
return buf_size;
vmdvideo_decode_end,
vmdvideo_decode_frame,
CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("Sierra VMD video"),
};
AVCodec vmdaudio_decoder = {
NULL,
NULL,
vmdaudio_decode_frame,
+ .long_name = NULL_IF_CONFIG_SMALL("Sierra VMD audio"),
};
projects / ffmpeg / blobdiff