diff options
Diffstat (limited to 'contrib/ffmpeg/libavcodec/vmdav.c')
| -rw-r--r-- | contrib/ffmpeg/libavcodec/vmdav.c | 572 |
1 files changed, 572 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavcodec/vmdav.c b/contrib/ffmpeg/libavcodec/vmdav.c new file mode 100644 index 000000000..a9937144e --- /dev/null +++ b/contrib/ffmpeg/libavcodec/vmdav.c @@ -0,0 +1,572 @@ +/* + * Sierra VMD Audio & Video Decoders + * Copyright (C) 2004 the ffmpeg project + * + * 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 + * + */ + +/** + * @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, 0x20, QUEUE_SIZE); + 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 %d\n", + 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() failed\n"); + 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; + int predictors[2]; +} VmdAudioContext; + +static 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, + 0x1D0, 0x1E0, 0x1F0, 0x200, 0x208, 0x210, 0x218, 0x220, 0x228, 0x230, + 0x238, 0x240, 0x248, 0x250, 0x258, 0x260, 0x268, 0x270, 0x278, 0x280, + 0x288, 0x290, 0x298, 0x2A0, 0x2A8, 0x2B0, 0x2B8, 0x2C0, 0x2C8, 0x2D0, + 0x2D8, 0x2E0, 0x2E8, 0x2F0, 0x2F8, 0x300, 0x308, 0x310, 0x318, 0x320, + 0x328, 0x330, 0x338, 0x340, 0x348, 0x350, 0x358, 0x360, 0x368, 0x370, + 0x378, 0x380, 0x388, 0x390, 0x398, 0x3A0, 0x3A8, 0x3B0, 0x3B8, 0x3C0, + 0x3C8, 0x3D0, 0x3D8, 0x3E0, 0x3E8, 0x3F0, 0x3F8, 0x400, 0x440, 0x480, + 0x4C0, 0x500, 0x540, 0x580, 0x5C0, 0x600, 0x640, 0x680, 0x6C0, 0x700, + 0x740, 0x780, 0x7C0, 0x800, 0x900, 0xA00, 0xB00, 0xC00, 0xD00, 0xE00, + 0xF00, 0x1000, 0x1400, 0x1800, 0x1C00, 0x2000, 0x3000, 0x4000 +}; + +static int vmdaudio_decode_init(AVCodecContext *avctx) +{ + VmdAudioContext *s = (VmdAudioContext *)avctx->priv_data; + + 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 = %d\n", + s->channels, s->bits, s->block_align, avctx->sample_rate); + + return 0; +} + +static void vmdaudio_decode_audio(VmdAudioContext *s, unsigned char *data, + uint8_t *buf, int stereo) +{ + int i; + int chan = 0; + int16_t *out = (int16_t*)data; + + for(i = 0; i < s->block_align; 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); + out[i] = s->predictors[chan]; + chan ^= stereo; + } +} + +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 (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; + } + } + } + } + + return s->block_align * 2; +} + +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 char *output_samples = (unsigned char *)data; + + /* point to the start of the encoded data */ + 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); + } 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); + } + + 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, +}; 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