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Diffstat (limited to 'ffmpeg1/libavcodec/vmdav.c')
-rw-r--r--ffmpeg1/libavcodec/vmdav.c662
1 files changed, 662 insertions, 0 deletions
diff --git a/ffmpeg1/libavcodec/vmdav.c b/ffmpeg1/libavcodec/vmdav.c
new file mode 100644
index 0000000..0e27ef6
--- /dev/null
+++ b/ffmpeg1/libavcodec/vmdav.c
@@ -0,0 +1,662 @@
+/*
+ * 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
+ * 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 "libavutil/channel_layout.h"
+#include "libavutil/common.h"
+#include "libavutil/intreadwrite.h"
+#include "avcodec.h"
+#include "internal.h"
+
+#define VMD_HEADER_SIZE 0x330
+#define PALETTE_COUNT 256
+
+/*
+ * Video Decoder
+ */
+
+typedef struct VmdVideoContext {
+
+ AVCodecContext *avctx;
+ AVFrame prev_frame;
+
+ 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(const unsigned char *src, int src_len,
+ unsigned char *dest, int dest_len)
+{
+ const unsigned char *s;
+ const unsigned char *s_end;
+ 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;
+ s_end = src + src_len;
+ d = dest;
+ d_end = d + dest_len;
+
+ if (s_end - s < 8)
+ return;
+ dataleft = AV_RL32(s);
+ s += 4;
+ memset(queue, 0x20, QUEUE_SIZE);
+ if (AV_RL32(s) == 0x56781234) {
+ s += 4;
+ qpos = 0x111;
+ speclen = 0xF + 3;
+ } else {
+ qpos = 0xFEE;
+ speclen = 100; /* no speclen */
+ }
+
+ while (s_end - s > 0 && dataleft > 0) {
+ tag = *s++;
+ if ((tag == 0xFF) && (dataleft > 8)) {
+ if (d_end - d < 8 || s_end - s < 8)
+ 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_end - d < 1 || s_end - s < 1)
+ return;
+ queue[qpos++] = *d++ = *s++;
+ qpos &= QUEUE_MASK;
+ dataleft--;
+ } else {
+ if (s_end - s < 2)
+ return;
+ chainofs = *s++;
+ chainofs |= ((*s & 0xF0) << 4);
+ chainlen = (*s++ & 0x0F) + 3;
+ if (chainlen == speclen) {
+ if (s_end - s < 1)
+ return;
+ chainlen = *s++ + 0xF + 3;
+ }
+ if (d_end - d < chainlen)
+ 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(const unsigned char *src, int src_len, int src_count,
+ unsigned char *dest, int dest_len)
+{
+ const unsigned char *ps;
+ const unsigned char *ps_end;
+ unsigned char *pd;
+ int i, l;
+ unsigned char *dest_end = dest + dest_len;
+
+ ps = src;
+ ps_end = src + src_len;
+ pd = dest;
+ if (src_count & 1) {
+ if (ps_end - ps < 1)
+ return 0;
+ *pd++ = *ps++;
+ }
+
+ src_count >>= 1;
+ i = 0;
+ do {
+ if (ps_end - ps < 1)
+ break;
+ l = *ps++;
+ if (l & 0x80) {
+ l = (l & 0x7F) * 2;
+ if (dest_end - pd < l || ps_end - ps < l)
+ return ps - src;
+ memcpy(pd, ps, l);
+ ps += l;
+ pd += l;
+ } else {
+ if (dest_end - pd < i || ps_end - ps < 2)
+ return ps - src;
+ for (i = 0; i < l; i++) {
+ *pd++ = ps[0];
+ *pd++ = ps[1];
+ }
+ ps += 2;
+ }
+ i += l;
+ } while (i < src_count);
+
+ return ps - src;
+}
+
+static void vmd_decode(VmdVideoContext *s, AVFrame *frame)
+{
+ int i;
+ unsigned int *palette32;
+ unsigned char r, g, b;
+
+ /* point to the start of the encoded data */
+ const unsigned char *p = s->buf + 16;
+ const unsigned char *p_end = s->buf + s->size;
+
+ const unsigned char *pb;
+ const unsigned char *pb_end;
+ 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;
+
+ 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_x < 0 || frame_width < 0 ||
+ frame_x >= s->avctx->width ||
+ frame_width > s->avctx->width ||
+ frame_x + frame_width > s->avctx->width)
+ return;
+ if (frame_y < 0 || frame_height < 0 ||
+ frame_y >= s->avctx->height ||
+ frame_height > s->avctx->height ||
+ frame_y + frame_height > s->avctx->height)
+ return;
+
+ 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 (s->prev_frame.data[0] &&
+ (frame_x || frame_y || (frame_width != s->avctx->width) ||
+ (frame_height != s->avctx->height))) {
+
+ memcpy(frame->data[0], s->prev_frame.data[0],
+ s->avctx->height * frame->linesize[0]);
+ }
+
+ /* check if there is a new palette */
+ if (s->buf[15] & 0x02) {
+ if (p_end - p < 2 + 3 * PALETTE_COUNT)
+ return;
+ 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] = 0xFFU << 24 | r << 16 | g << 8 | b;
+ palette32[i] |= palette32[i] >> 6 & 0x30303;
+ }
+ }
+ if (p < p_end) {
+ /* originally UnpackFrame in VAG's code */
+ pb = p;
+ pb_end = p_end;
+ meth = *pb++;
+ if (meth & 0x80) {
+ lz_unpack(pb, p_end - pb, s->unpack_buffer, s->unpack_buffer_size);
+ meth &= 0x7F;
+ pb = s->unpack_buffer;
+ pb_end = s->unpack_buffer + s->unpack_buffer_size;
+ }
+
+ dp = &frame->data[0][frame_y * frame->linesize[0] + frame_x];
+ 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 {
+ if (pb_end - pb < 1)
+ return;
+ len = *pb++;
+ if (len & 0x80) {
+ len = (len & 0x7F) + 1;
+ if (ofs + len > frame_width || pb_end - pb < len)
+ return;
+ memcpy(&dp[ofs], pb, len);
+ pb += len;
+ ofs += len;
+ } else {
+ /* interframe pixel copy */
+ if (ofs + len + 1 > frame_width || !s->prev_frame.data[0])
+ 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, "offset > width (%d > %d)\n",
+ ofs, frame_width);
+ break;
+ }
+ dp += frame->linesize[0];
+ pp += s->prev_frame.linesize[0];
+ }
+ break;
+
+ case 2:
+ for (i = 0; i < frame_height; i++) {
+ if (pb_end -pb < frame_width)
+ return;
+ memcpy(dp, pb, frame_width);
+ pb += frame_width;
+ dp += frame->linesize[0];
+ pp += s->prev_frame.linesize[0];
+ }
+ break;
+
+ case 3:
+ for (i = 0; i < frame_height; i++) {
+ ofs = 0;
+ do {
+ if (pb_end - pb < 1)
+ return;
+ len = *pb++;
+ if (len & 0x80) {
+ len = (len & 0x7F) + 1;
+ if (pb_end - pb < 1)
+ return;
+ if (*pb++ == 0xFF)
+ len = rle_unpack(pb, pb_end - pb, len, &dp[ofs], frame_width - ofs);
+ else {
+ if (pb_end - pb < len)
+ return;
+ memcpy(&dp[ofs], pb, len);
+ }
+ pb += len;
+ ofs += len;
+ } else {
+ /* interframe pixel copy */
+ if (ofs + len + 1 > frame_width || !s->prev_frame.data[0])
+ 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, "offset > width (%d > %d)\n",
+ ofs, frame_width);
+ }
+ dp += frame->linesize[0];
+ pp += s->prev_frame.linesize[0];
+ }
+ break;
+ }
+ }
+}
+
+static av_cold int vmdvideo_decode_init(AVCodecContext *avctx)
+{
+ VmdVideoContext *s = 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 = AV_PIX_FMT_PAL8;
+
+ /* make sure the VMD header made it */
+ if (s->avctx->extradata_size != VMD_HEADER_SIZE) {
+ av_log(s->avctx, AV_LOG_ERROR, "expected extradata size of %d\n",
+ VMD_HEADER_SIZE);
+ return -1;
+ }
+ vmd_header = (unsigned char *)avctx->extradata;
+
+ s->unpack_buffer_size = AV_RL32(&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);
+ }
+
+ avcodec_get_frame_defaults(&s->prev_frame);
+
+ return 0;
+}
+
+static int vmdvideo_decode_frame(AVCodecContext *avctx,
+ void *data, int *got_frame,
+ AVPacket *avpkt)
+{
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
+ VmdVideoContext *s = avctx->priv_data;
+ AVFrame *frame = data;
+ int ret;
+
+ s->buf = buf;
+ s->size = buf_size;
+
+ if (buf_size < 16)
+ return buf_size;
+
+ if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
+ return ret;
+
+ vmd_decode(s, frame);
+
+ /* make the palette available on the way out */
+ memcpy(frame->data[1], s->palette, PALETTE_COUNT * 4);
+
+ /* shuffle frames */
+ av_frame_unref(&s->prev_frame);
+ if ((ret = av_frame_ref(&s->prev_frame, frame)) < 0)
+ return ret;
+
+ *got_frame = 1;
+
+ /* report that the buffer was completely consumed */
+ return buf_size;
+}
+
+static av_cold int vmdvideo_decode_end(AVCodecContext *avctx)
+{
+ VmdVideoContext *s = avctx->priv_data;
+
+ av_frame_unref(&s->prev_frame);
+ av_free(s->unpack_buffer);
+
+ return 0;
+}
+
+
+/*
+ * Audio Decoder
+ */
+
+#define BLOCK_TYPE_AUDIO 1
+#define BLOCK_TYPE_INITIAL 2
+#define BLOCK_TYPE_SILENCE 3
+
+typedef struct VmdAudioContext {
+ int out_bps;
+ int chunk_size;
+} VmdAudioContext;
+
+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,
+ 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 av_cold int vmdaudio_decode_init(AVCodecContext *avctx)
+{
+ VmdAudioContext *s = avctx->priv_data;
+
+ if (avctx->channels < 1 || avctx->channels > 2) {
+ av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n");
+ return AVERROR(EINVAL);
+ }
+ if (avctx->block_align < 1 || avctx->block_align % avctx->channels) {
+ av_log(avctx, AV_LOG_ERROR, "invalid block align\n");
+ return AVERROR(EINVAL);
+ }
+
+ avctx->channel_layout = avctx->channels == 1 ? AV_CH_LAYOUT_MONO :
+ AV_CH_LAYOUT_STEREO;
+
+ 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);
+
+ s->chunk_size = avctx->block_align + avctx->channels * (s->out_bps == 2);
+
+ 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 decode_audio_s16(int16_t *out, const uint8_t *buf, int buf_size,
+ int channels)
+{
+ int ch;
+ const uint8_t *buf_end = buf + buf_size;
+ int predictor[2];
+ int st = channels - 1;
+
+ /* decode initial raw sample */
+ for (ch = 0; ch < channels; ch++) {
+ predictor[ch] = (int16_t)AV_RL16(buf);
+ buf += 2;
+ *out++ = predictor[ch];
+ }
+
+ /* decode DPCM samples */
+ ch = 0;
+ while (buf < buf_end) {
+ uint8_t b = *buf++;
+ if (b & 0x80)
+ predictor[ch] -= vmdaudio_table[b & 0x7F];
+ else
+ predictor[ch] += vmdaudio_table[b];
+ predictor[ch] = av_clip_int16(predictor[ch]);
+ *out++ = predictor[ch];
+ ch ^= st;
+ }
+}
+
+static int vmdaudio_decode_frame(AVCodecContext *avctx, void *data,
+ int *got_frame_ptr, AVPacket *avpkt)
+{
+ AVFrame *frame = data;
+ const uint8_t *buf = avpkt->data;
+ const uint8_t *buf_end;
+ int buf_size = avpkt->size;
+ VmdAudioContext *s = avctx->priv_data;
+ int block_type, silent_chunks, audio_chunks;
+ int ret;
+ uint8_t *output_samples_u8;
+ int16_t *output_samples_s16;
+
+ if (buf_size < 16) {
+ av_log(avctx, AV_LOG_WARNING, "skipping small junk packet\n");
+ *got_frame_ptr = 0;
+ return buf_size;
+ }
+
+ 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;
+
+ /* get number of silent chunks */
+ silent_chunks = 0;
+ if (block_type == BLOCK_TYPE_INITIAL) {
+ uint32_t flags;
+ if (buf_size < 4) {
+ av_log(avctx, AV_LOG_ERROR, "packet is too small\n");
+ return AVERROR(EINVAL);
+ }
+ 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
+ }
+
+ /* ensure output buffer is large enough */
+ audio_chunks = buf_size / s->chunk_size;
+
+ /* get output buffer */
+ frame->nb_samples = ((silent_chunks + audio_chunks) * avctx->block_align) /
+ avctx->channels;
+ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
+ return ret;
+ output_samples_u8 = frame->data[0];
+ output_samples_s16 = (int16_t *)frame->data[0];
+
+ /* decode silent chunks */
+ if (silent_chunks > 0) {
+ int silent_size = avctx->block_align * silent_chunks;
+ if (s->out_bps == 2) {
+ memset(output_samples_s16, 0x00, silent_size * 2);
+ output_samples_s16 += silent_size;
+ } else {
+ memset(output_samples_u8, 0x80, silent_size);
+ output_samples_u8 += silent_size;
+ }
+ }
+
+ /* decode audio chunks */
+ if (audio_chunks > 0) {
+ buf_end = buf + buf_size;
+ while (buf_end - buf >= s->chunk_size) {
+ if (s->out_bps == 2) {
+ decode_audio_s16(output_samples_s16, buf, s->chunk_size,
+ avctx->channels);
+ output_samples_s16 += avctx->block_align;
+ } else {
+ memcpy(output_samples_u8, buf, s->chunk_size);
+ output_samples_u8 += avctx->block_align;
+ }
+ buf += s->chunk_size;
+ }
+ }
+
+ *got_frame_ptr = 1;
+
+ return avpkt->size;
+}
+
+
+/*
+ * Public Data Structures
+ */
+
+AVCodec ff_vmdvideo_decoder = {
+ .name = "vmdvideo",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_VMDVIDEO,
+ .priv_data_size = sizeof(VmdVideoContext),
+ .init = vmdvideo_decode_init,
+ .close = vmdvideo_decode_end,
+ .decode = vmdvideo_decode_frame,
+ .capabilities = CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("Sierra VMD video"),
+};
+
+AVCodec ff_vmdaudio_decoder = {
+ .name = "vmdaudio",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .id = AV_CODEC_ID_VMDAUDIO,
+ .priv_data_size = sizeof(VmdAudioContext),
+ .init = vmdaudio_decode_init,
+ .decode = vmdaudio_decode_frame,
+ .capabilities = CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("Sierra VMD audio"),
+};
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 19:31:28 +0000