bmv: Split audio and video decoder

Signed-off-by: Diego Biurrun <diego@biurrun.de>

1 files changed, 0 insertions, 357 deletions

diff --git a/libavcodec/bmv.c b/libavcodec/bmv.c
deleted file mode 100644
index 3c017d0e7e..0000000000
--- a/libavcodec/bmv.c
+++ /dev/null
@@ -1,357 +0,0 @@
-/*
- * Discworld II BMV video and audio decoder
- * Copyright (c) 2011 Konstantin Shishkov
- *
- * This file is part of Libav.
- *
- * 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.
- *
- * 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 Libav; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include "libavutil/channel_layout.h"
-#include "avcodec.h"
-#include "bytestream.h"
-#include "internal.h"
-
-enum BMVFlags{
-    BMV_NOP = 0,
-    BMV_END,
-    BMV_DELTA,
-    BMV_INTRA,
-
-    BMV_SCROLL  = 0x04,
-    BMV_PALETTE = 0x08,
-    BMV_COMMAND = 0x10,
-    BMV_AUDIO   = 0x20,
-    BMV_EXT     = 0x40,
-    BMV_PRINT   = 0x80
-};
-
-#define SCREEN_WIDE 640
-#define SCREEN_HIGH 429
-
-typedef struct BMVDecContext {
-    AVCodecContext *avctx;
-
-    uint8_t *frame, frame_base[SCREEN_WIDE * (SCREEN_HIGH + 1)];
-    uint32_t pal[256];
-    const uint8_t *stream;
-} BMVDecContext;
-
-#define NEXT_BYTE(v) v = forward ? v + 1 : v - 1;
-
-static int decode_bmv_frame(const uint8_t *source, int src_len, uint8_t *frame, int frame_off)
-{
-    unsigned val, saved_val = 0;
-    int tmplen = src_len;
-    const uint8_t *src, *source_end = source + src_len;
-    uint8_t *frame_end = frame + SCREEN_WIDE * SCREEN_HIGH;
-    uint8_t *dst, *dst_end;
-    int len, mask;
-    int forward = (frame_off <= -SCREEN_WIDE) || (frame_off >= 0);
-    int read_two_nibbles, flag;
-    int advance_mode;
-    int mode = 0;
-    int i;
-
-    if (src_len <= 0)
-        return AVERROR_INVALIDDATA;
-
-    if (forward) {
-        src = source;
-        dst = frame;
-        dst_end = frame_end;
-    } else {
-        src = source + src_len - 1;
-        dst = frame_end - 1;
-        dst_end = frame - 1;
-    }
-    for (;;) {
-        int shift = 0;
-        flag = 0;
-
-        /* The mode/len decoding is a bit strange:
-         * values are coded as variable-length codes with nibble units,
-         * code end is signalled by two top bits in the nibble being nonzero.
-         * And since data is bytepacked and we read two nibbles at a time,
-         * we may get a nibble belonging to the next code.
-         * Hence this convoluted loop.
-         */
-        if (!mode || (tmplen == 4)) {
-            if (src < source || src >= source_end)
-                return AVERROR_INVALIDDATA;
-            val = *src;
-            read_two_nibbles = 1;
-        } else {
-            val = saved_val;
-            read_two_nibbles = 0;
-        }
-        if (!(val & 0xC)) {
-            for (;;) {
-                if (!read_two_nibbles) {
-                    if (src < source || src >= source_end)
-                        return AVERROR_INVALIDDATA;
-                    shift += 2;
-                    val |= *src << shift;
-                    if (*src & 0xC)
-                        break;
-                }
-                // two upper bits of the nibble is zero,
-                // so shift top nibble value down into their place
-                read_two_nibbles = 0;
-                shift += 2;
-                mask = (1 << shift) - 1;
-                val = ((val >> 2) & ~mask) | (val & mask);
-                NEXT_BYTE(src);
-                if ((val & (0xC << shift))) {
-                    flag = 1;
-                    break;
-                }
-            }
-        } else if (mode) {
-            flag = tmplen != 4;
-        }
-        if (flag) {
-            tmplen = 4;
-        } else {
-            saved_val = val >> (4 + shift);
-            tmplen = 0;
-            val &= (1 << (shift + 4)) - 1;
-            NEXT_BYTE(src);
-        }
-        advance_mode = val & 1;
-        len = (val >> 1) - 1;
-        mode += 1 + advance_mode;
-        if (mode >= 4)
-            mode -= 3;
-        if (len <= 0 || FFABS(dst_end - dst) < len)
-            return AVERROR_INVALIDDATA;
-        switch (mode) {
-        case 1:
-            if (forward) {
-                if (dst - frame + SCREEN_WIDE < frame_off ||
-                        dst - frame + SCREEN_WIDE + frame_off < 0 ||
-                        frame_end - dst < frame_off + len ||
-                        frame_end - dst < len)
-                    return AVERROR_INVALIDDATA;
-                for (i = 0; i < len; i++)
-                    dst[i] = dst[frame_off + i];
-                dst += len;
-            } else {
-                dst -= len;
-                if (dst - frame + SCREEN_WIDE < frame_off ||
-                        dst - frame + SCREEN_WIDE + frame_off < 0 ||
-                        frame_end - dst < frame_off + len ||
-                        frame_end - dst < len)
-                    return AVERROR_INVALIDDATA;
-                for (i = len - 1; i >= 0; i--)
-                    dst[i] = dst[frame_off + i];
-            }
-            break;
-        case 2:
-            if (forward) {
-                if (source + src_len - src < len)
-                    return AVERROR_INVALIDDATA;
-                memcpy(dst, src, len);
-                dst += len;
-                src += len;
-            } else {
-                if (src - source < len)
-                    return AVERROR_INVALIDDATA;
-                dst -= len;
-                src -= len;
-                memcpy(dst, src, len);
-            }
-            break;
-        case 3:
-            val = forward ? dst[-1] : dst[1];
-            if (forward) {
-                memset(dst, val, len);
-                dst += len;
-            } else {
-                dst -= len;
-                memset(dst, val, len);
-            }
-            break;
-        default:
-            break;
-        }
-        if (dst == dst_end)
-            return 0;
-    }
-    return 0;
-}
-
-static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
-                        AVPacket *pkt)
-{
-    BMVDecContext * const c = avctx->priv_data;
-    AVFrame *frame = data;
-    int type, scr_off;
-    int i, ret;
-    uint8_t *srcptr, *outptr;
-
-    c->stream = pkt->data;
-    type = bytestream_get_byte(&c->stream);
-    if (type & BMV_AUDIO) {
-        int blobs = bytestream_get_byte(&c->stream);
-        if (pkt->size < blobs * 65 + 2) {
-            av_log(avctx, AV_LOG_ERROR, "Audio data doesn't fit in frame\n");
-            return AVERROR_INVALIDDATA;
-        }
-        c->stream += blobs * 65;
-    }
-    if (type & BMV_COMMAND) {
-        int command_size = (type & BMV_PRINT) ? 8 : 10;
-        if (c->stream - pkt->data + command_size > pkt->size) {
-            av_log(avctx, AV_LOG_ERROR, "Command data doesn't fit in frame\n");
-            return AVERROR_INVALIDDATA;
-        }
-        c->stream += command_size;
-    }
-    if (type & BMV_PALETTE) {
-        if (c->stream - pkt->data > pkt->size - 768) {
-            av_log(avctx, AV_LOG_ERROR, "Palette data doesn't fit in frame\n");
-            return AVERROR_INVALIDDATA;
-        }
-        for (i = 0; i < 256; i++)
-            c->pal[i] = bytestream_get_be24(&c->stream);
-    }
-    if (type & BMV_SCROLL) {
-        if (c->stream - pkt->data > pkt->size - 2) {
-            av_log(avctx, AV_LOG_ERROR, "Screen offset data doesn't fit in frame\n");
-            return AVERROR_INVALIDDATA;
-        }
-        scr_off = (int16_t)bytestream_get_le16(&c->stream);
-    } else if ((type & BMV_INTRA) == BMV_INTRA) {
-        scr_off = -640;
-    } else {
-        scr_off = 0;
-    }
-
-    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
-        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
-        return ret;
-    }
-
-    if (decode_bmv_frame(c->stream, pkt->size - (c->stream - pkt->data), c->frame, scr_off)) {
-        av_log(avctx, AV_LOG_ERROR, "Error decoding frame data\n");
-        return AVERROR_INVALIDDATA;
-    }
-
-    memcpy(frame->data[1], c->pal, AVPALETTE_SIZE);
-    frame->palette_has_changed = type & BMV_PALETTE;
-
-    outptr = frame->data[0];
-    srcptr = c->frame;
-
-    for (i = 0; i < avctx->height; i++) {
-        memcpy(outptr, srcptr, avctx->width);
-        srcptr += avctx->width;
-        outptr += frame->linesize[0];
-    }
-
-    *got_frame = 1;
-
-    /* always report that the buffer was completely consumed */
-    return pkt->size;
-}
-
-static av_cold int decode_init(AVCodecContext *avctx)
-{
-    BMVDecContext * const c = avctx->priv_data;
-
-    c->avctx = avctx;
-    avctx->pix_fmt = AV_PIX_FMT_PAL8;
-
-    c->frame = c->frame_base + 640;
-
-    return 0;
-}
-
-static const int bmv_aud_mults[16] = {
-    16512, 8256, 4128, 2064, 1032, 516, 258, 192, 129, 88, 64, 56, 48, 40, 36, 32
-};
-
-static av_cold int bmv_aud_decode_init(AVCodecContext *avctx)
-{
-    avctx->channels       = 2;
-    avctx->channel_layout = AV_CH_LAYOUT_STEREO;
-    avctx->sample_fmt     = AV_SAMPLE_FMT_S16;
-
-    return 0;
-}
-
-static int bmv_aud_decode_frame(AVCodecContext *avctx, void *data,
-                                int *got_frame_ptr, AVPacket *avpkt)
-{
-    AVFrame *frame     = data;
-    const uint8_t *buf = avpkt->data;
-    int buf_size = avpkt->size;
-    int blocks = 0, total_blocks, i;
-    int ret;
-    int16_t *output_samples;
-    int scale[2];
-
-    total_blocks = *buf++;
-    if (buf_size < total_blocks * 65 + 1) {
-        av_log(avctx, AV_LOG_ERROR, "expected %d bytes, got %d\n",
-               total_blocks * 65 + 1, buf_size);
-        return AVERROR_INVALIDDATA;
-    }
-
-    /* get output buffer */
-    frame->nb_samples = total_blocks * 32;
-    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
-        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
-        return ret;
-    }
-    output_samples = (int16_t *)frame->data[0];
-
-    for (blocks = 0; blocks < total_blocks; blocks++) {
-        uint8_t code = *buf++;
-        code = (code >> 1) | (code << 7);
-        scale[0] = bmv_aud_mults[code & 0xF];
-        scale[1] = bmv_aud_mults[code >> 4];
-        for (i = 0; i < 32; i++) {
-            *output_samples++ = av_clip_int16((scale[0] * (int8_t)*buf++) >> 5);
-            *output_samples++ = av_clip_int16((scale[1] * (int8_t)*buf++) >> 5);
-        }
-    }
-
-    *got_frame_ptr = 1;
-
-    return buf_size;
-}
-
-AVCodec ff_bmv_video_decoder = {
-    .name           = "bmv_video",
-    .long_name      = NULL_IF_CONFIG_SMALL("Discworld II BMV video"),
-    .type           = AVMEDIA_TYPE_VIDEO,
-    .id             = AV_CODEC_ID_BMV_VIDEO,
-    .priv_data_size = sizeof(BMVDecContext),
-    .init           = decode_init,
-    .decode         = decode_frame,
-    .capabilities   = CODEC_CAP_DR1,
-};
-
-AVCodec ff_bmv_audio_decoder = {
-    .name           = "bmv_audio",
-    .long_name      = NULL_IF_CONFIG_SMALL("Discworld II BMV audio"),
-    .type           = AVMEDIA_TYPE_AUDIO,
-    .id             = AV_CODEC_ID_BMV_AUDIO,
-    .init           = bmv_aud_decode_init,
-    .decode         = bmv_aud_decode_frame,
-    .capabilities   = CODEC_CAP_DR1,
-};