vmdav.c
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上传日期:2014-04-03
资源大小:7248k
文件大小:17k
源码类别:
Windows CE
开发平台:
C/C++
- /*
- * Sierra VMD Audio & Video Decoders
- * Copyright (C) 2004 the ffmpeg project
- *
- * This library 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 of the License, or (at your option) any later version.
- *
- * This library 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- */
- /**
- * @file vmdvideo.c
- * Sierra VMD audio & video decoders
- * by Vladimir "VAG" Gneushev (vagsoft at mail.ru)
- * for more information on the Sierra VMD format, visit:
- * http://www.pcisys.net/~melanson/codecs/
- *
- * The video decoder outputs PAL8 colorspace data. The decoder expects
- * a 0x330-byte VMD file header to be transmitted via extradata during
- * codec initialization. Each encoded frame that is sent to this decoder
- * is expected to be prepended with the appropriate 16-byte frame
- * information record from the VMD file.
- *
- * The audio decoder, like the video decoder, expects each encoded data
- * chunk to be prepended with the appropriate 16-byte frame information
- * record from the VMD file. It does not require the 0x330-byte VMD file
- * header, but it does need the audio setup parameters passed in through
- * normal libavcodec API means.
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <unistd.h>
- #include "common.h"
- #include "avcodec.h"
- #include "dsputil.h"
- #define VMD_HEADER_SIZE 0x330
- #define PALETTE_COUNT 256
- /*
- * Video Decoder
- */
- typedef struct VmdVideoContext {
- AVCodecContext *avctx;
- DSPContext dsp;
- AVFrame frame;
- AVFrame prev_frame;
- unsigned char *buf;
- int size;
- unsigned char palette[PALETTE_COUNT * 4];
- unsigned char *unpack_buffer;
- int unpack_buffer_size;
- } VmdVideoContext;
- #define QUEUE_SIZE 0x1000
- #define QUEUE_MASK 0x0FFF
- static void lz_unpack(unsigned char *src, unsigned char *dest, int dest_len)
- {
- unsigned char *s;
- unsigned char *d;
- unsigned char *d_end;
- unsigned char queue[QUEUE_SIZE];
- unsigned int qpos;
- unsigned int dataleft;
- unsigned int chainofs;
- unsigned int chainlen;
- unsigned int speclen;
- unsigned char tag;
- unsigned int i, j;
- s = src;
- d = dest;
- d_end = d + dest_len;
- dataleft = LE_32(s);
- s += 4;
- memset(queue, QUEUE_SIZE, 0x20);
- if (LE_32(s) == 0x56781234) {
- s += 4;
- qpos = 0x111;
- speclen = 0xF + 3;
- } else {
- qpos = 0xFEE;
- speclen = 100; /* no speclen */
- }
- while (dataleft > 0) {
- tag = *s++;
- if ((tag == 0xFF) && (dataleft > 8)) {
- if (d + 8 > d_end)
- return;
- for (i = 0; i < 8; i++) {
- queue[qpos++] = *d++ = *s++;
- qpos &= QUEUE_MASK;
- }
- dataleft -= 8;
- } else {
- for (i = 0; i < 8; i++) {
- if (dataleft == 0)
- break;
- if (tag & 0x01) {
- if (d + 1 > d_end)
- return;
- queue[qpos++] = *d++ = *s++;
- qpos &= QUEUE_MASK;
- dataleft--;
- } else {
- chainofs = *s++;
- chainofs |= ((*s & 0xF0) << 4);
- chainlen = (*s++ & 0x0F) + 3;
- if (chainlen == speclen)
- chainlen = *s++ + 0xF + 3;
- if (d + chainlen > d_end)
- return;
- for (j = 0; j < chainlen; j++) {
- *d = queue[chainofs++ & QUEUE_MASK];
- queue[qpos++] = *d++;
- qpos &= QUEUE_MASK;
- }
- dataleft -= chainlen;
- }
- tag >>= 1;
- }
- }
- }
- }
- static int rle_unpack(unsigned char *src, unsigned char *dest,
- int src_len, int dest_len)
- {
- unsigned char *ps;
- unsigned char *pd;
- int i, l;
- unsigned char *dest_end = dest + dest_len;
- ps = src;
- pd = dest;
- if (src_len & 1)
- *pd++ = *ps++;
- src_len >>= 1;
- i = 0;
- do {
- l = *ps++;
- if (l & 0x80) {
- l = (l & 0x7F) * 2;
- if (pd + l > dest_end)
- return (ps - src);
- memcpy(pd, ps, l);
- ps += l;
- pd += l;
- } else {
- if (pd + i > dest_end)
- return (ps - src);
- for (i = 0; i < l; i++) {
- *pd++ = ps[0];
- *pd++ = ps[1];
- }
- ps += 2;
- }
- i += l;
- } while (i < src_len);
- return (ps - src);
- }
- static void vmd_decode(VmdVideoContext *s)
- {
- int i;
- unsigned int *palette32;
- unsigned char r, g, b;
- /* point to the start of the encoded data */
- unsigned char *p = s->buf + 16;
- unsigned char *pb;
- unsigned char meth;
- unsigned char *dp; /* pointer to current frame */
- unsigned char *pp; /* pointer to previous frame */
- unsigned char len;
- int ofs;
- int frame_x, frame_y;
- 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;
- /* 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) ||
- (frame_height != s->avctx->height)) {
- memcpy(s->frame.data[0], s->prev_frame.data[0],
- s->avctx->height * s->frame.linesize[0]);
- }
- /* check if there is a new palette */
- if (s->buf[15] & 0x02) {
- p += 2;
- palette32 = (unsigned int *)s->palette;
- for (i = 0; i < PALETTE_COUNT; i++) {
- r = *p++ * 4;
- g = *p++ * 4;
- b = *p++ * 4;
- palette32[i] = (r << 16) | (g << 8) | (b);
- }
- s->size -= (256 * 3 + 2);
- }
- if (s->size >= 0) {
- /* originally UnpackFrame in VAG's code */
- pb = p;
- meth = *pb++;
- if (meth & 0x80) {
- lz_unpack(pb, s->unpack_buffer, s->unpack_buffer_size);
- meth &= 0x7F;
- pb = s->unpack_buffer;
- }
- 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:
- for (i = 0; i < frame_height; i++) {
- ofs = 0;
- do {
- len = *pb++;
- if (len & 0x80) {
- len = (len & 0x7F) + 1;
- if (ofs + len > frame_width)
- return;
- memcpy(&dp[ofs], pb, len);
- pb += len;
- ofs += len;
- } else {
- /* interframe pixel copy */
- if (ofs + len + 1 > frame_width)
- return;
- memcpy(&dp[ofs], &pp[ofs], len + 1);
- ofs += len + 1;
- }
- } while (ofs < frame_width);
- if (ofs > frame_width) {
- av_log(s->avctx, AV_LOG_ERROR, "VMD video: offset > width (%d > %d)n",
- ofs, frame_width);
- break;
- }
- dp += s->frame.linesize[0];
- pp += s->prev_frame.linesize[0];
- }
- break;
- case 2:
- for (i = 0; i < frame_height; i++) {
- memcpy(dp, pb, frame_width);
- pb += frame_width;
- dp += s->frame.linesize[0];
- pp += s->prev_frame.linesize[0];
- }
- break;
- case 3:
- for (i = 0; i < frame_height; i++) {
- ofs = 0;
- do {
- len = *pb++;
- if (len & 0x80) {
- len = (len & 0x7F) + 1;
- if (*pb++ == 0xFF)
- len = rle_unpack(pb, &dp[ofs], len, frame_width - ofs);
- else
- memcpy(&dp[ofs], pb, len);
- pb += len;
- ofs += len;
- } else {
- /* interframe pixel copy */
- if (ofs + len + 1 > frame_width)
- return;
- memcpy(&dp[ofs], &pp[ofs], len + 1);
- ofs += len + 1;
- }
- } while (ofs < frame_width);
- if (ofs > frame_width) {
- av_log(s->avctx, AV_LOG_ERROR, "VMD video: offset > width (%d > %d)n",
- ofs, frame_width);
- }
- dp += s->frame.linesize[0];
- pp += s->prev_frame.linesize[0];
- }
- break;
- }
- }
- }
- static int vmdvideo_decode_init(AVCodecContext *avctx)
- {
- VmdVideoContext *s = (VmdVideoContext *)avctx->priv_data;
- int i;
- unsigned int *palette32;
- int palette_index = 0;
- unsigned char r, g, b;
- unsigned char *vmd_header;
- unsigned char *raw_palette;
- 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) {
- av_log(s->avctx, AV_LOG_ERROR, "VMD video: expected extradata size of %dn",
- VMD_HEADER_SIZE);
- return -1;
- }
- vmd_header = (unsigned char *)avctx->extradata;
- s->unpack_buffer_size = LE_32(&vmd_header[800]);
- s->unpack_buffer = av_malloc(s->unpack_buffer_size);
- if (!s->unpack_buffer)
- return -1;
- /* load up the initial palette */
- raw_palette = &vmd_header[28];
- palette32 = (unsigned int *)s->palette;
- for (i = 0; i < PALETTE_COUNT; i++) {
- r = raw_palette[palette_index++] * 4;
- g = raw_palette[palette_index++] * 4;
- b = raw_palette[palette_index++] * 4;
- 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)
- {
- VmdVideoContext *s = (VmdVideoContext *)avctx->priv_data;
- s->buf = buf;
- s->size = buf_size;
- if (buf_size < 16)
- return buf_size;
- s->frame.reference = 1;
- if (avctx->get_buffer(avctx, &s->frame)) {
- av_log(s->avctx, AV_LOG_ERROR, "VMD Video: get_buffer() failedn");
- return -1;
- }
- vmd_decode(s);
- /* 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;
- *data_size = sizeof(AVFrame);
- *(AVFrame*)data = s->frame;
- /* report that the buffer was completely consumed */
- return buf_size;
- }
- static int vmdvideo_decode_end(AVCodecContext *avctx)
- {
- VmdVideoContext *s = (VmdVideoContext *)avctx->priv_data;
- if (s->prev_frame.data[0])
- avctx->release_buffer(avctx, &s->prev_frame);
- av_free(s->unpack_buffer);
- return 0;
- }
- /*
- * Audio Decoder
- */
- typedef struct VmdAudioContext {
- AVCodecContext *avctx;
- int channels;
- int bits;
- int block_align;
- unsigned char steps8[16];
- unsigned short steps16[16];
- unsigned short steps128[256];
- short predictors[2];
- } VmdAudioContext;
- static int vmdaudio_decode_init(AVCodecContext *avctx)
- {
- VmdAudioContext *s = (VmdAudioContext *)avctx->priv_data;
- int i;
- s->avctx = avctx;
- s->channels = avctx->channels;
- s->bits = avctx->bits_per_sample;
- s->block_align = avctx->block_align;
- av_log(s->avctx, AV_LOG_DEBUG, "%d channels, %d bits/sample, block align = %d, sample rate = %dn",
- s->channels, s->bits, s->block_align, avctx->sample_rate);
- /* set up the steps8 and steps16 tables */
- for (i = 0; i < 8; i++) {
- if (i < 4)
- s->steps8[i] = i;
- else
- s->steps8[i] = s->steps8[i - 1] + i - 1;
- if (i == 0)
- s->steps16[i] = 0;
- else if (i == 1)
- s->steps16[i] = 4;
- else if (i == 2)
- s->steps16[i] = 16;
- else
- s->steps16[i] = 1 << (i + 4);
- }
- /* set up the step128 table */
- s->steps128[0] = 0;
- s->steps128[1] = 8;
- for (i = 0x02; i <= 0x20; i++)
- s->steps128[i] = (i - 1) << 4;
- for (i = 0x21; i <= 0x60; i++)
- s->steps128[i] = (i + 0x1F) << 3;
- for (i = 0x61; i <= 0x70; i++)
- s->steps128[i] = (i - 0x51) << 6;
- for (i = 0x71; i <= 0x78; i++)
- s->steps128[i] = (i - 0x69) << 8;
- for (i = 0x79; i <= 0x7D; i++)
- s->steps128[i] = (i - 0x75) << 10;
- s->steps128[0x7E] = 0x3000;
- s->steps128[0x7F] = 0x4000;
- /* set up the negative half of each table */
- for (i = 0; i < 8; i++) {
- s->steps8[i + 8] = -s->steps8[i];
- s->steps16[i + 8] = -s->steps16[i];
- }
- for (i = 0; i < 128; i++)
- s->steps128[i + 128] = -s->steps128[i];
- return 0;
- }
- static void vmdaudio_decode_audio(VmdAudioContext *s, unsigned char *data,
- uint8_t *buf, int ratio) {
- }
- static int vmdaudio_loadsound(VmdAudioContext *s, unsigned char *data,
- uint8_t *buf, int silence)
- {
- int bytes_decoded = 0;
- int i;
- if (silence)
- av_log(s->avctx, AV_LOG_INFO, "silent block!n");
- if (s->channels == 2) {
- /* stereo handling */
- if ((s->block_align & 0x01) == 0) {
- if (silence)
- memset(data, 0, s->block_align * 2);
- else
- vmdaudio_decode_audio(s, data, buf, 1);
- } else {
- if (silence)
- memset(data, 0, s->block_align * 2);
- else
- vmdaudio_decode_audio(s, data, buf, 1);
- }
- } else {
- /* mono handling */
- if (silence) {
- if (s->bits == 16) {
- memset(data, 0, s->block_align * 2);
- bytes_decoded = s->block_align * 2;
- } else {
- // memset(data, 0x00, s->block_align);
- // bytes_decoded = s->block_align;
- memset(data, 0x00, s->block_align * 2);
- bytes_decoded = s->block_align * 2;
- }
- } else {
- /* copy the data but convert it to signed */
- for (i = 0; i < s->block_align; i++)
- data[i * 2 + 1] = buf[i] + 0x80;
- bytes_decoded = s->block_align * 2;
- }
- }
- return bytes_decoded;
- }
- static int vmdaudio_decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- uint8_t *buf, int buf_size)
- {
- VmdAudioContext *s = (VmdAudioContext *)avctx->priv_data;
- unsigned int sound_flags;
- unsigned char *output_samples = (unsigned char *)data;
- /* point to the start of the encoded data */
- unsigned char *p = buf + 16;
- unsigned char *p_end = buf + buf_size;
- if (buf_size < 16)
- 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 contains audio and silence mixed together */
- sound_flags = LE_32(p);
- p += 4;
- /* do something with extrabufs here? */
- while (p < p_end) {
- if (sound_flags & 0x01)
- /* silence */
- *data_size += vmdaudio_loadsound(s, output_samples, p, 1);
- else {
- /* audio */
- *data_size += vmdaudio_loadsound(s, output_samples, p, 0);
- p += s->block_align;
- }
- output_samples += (s->block_align * s->bits / 8);
- sound_flags >>= 1;
- }
- } else if (buf[6] == 3) {
- /* silent chunk */
- *data_size = vmdaudio_loadsound(s, output_samples, p, 1);
- }
- return buf_size;
- }
- /*
- * Public Data Structures
- */
- AVCodec vmdvideo_decoder = {
- "vmdvideo",
- CODEC_TYPE_VIDEO,
- CODEC_ID_VMDVIDEO,
- sizeof(VmdVideoContext),
- vmdvideo_decode_init,
- NULL,
- vmdvideo_decode_end,
- vmdvideo_decode_frame,
- CODEC_CAP_DR1,
- };
- AVCodec vmdaudio_decoder = {
- "vmdaudio",
- CODEC_TYPE_AUDIO,
- CODEC_ID_VMDAUDIO,
- sizeof(VmdAudioContext),
- vmdaudio_decode_init,
- NULL,
- NULL,
- vmdaudio_decode_frame,
- };