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author | Paul B Mahol <onemda@gmail.com> | 2016-06-17 12:30:34 -0400 |
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committer | Vittorio Giovara <vittorio.giovara@gmail.com> | 2016-06-20 15:48:12 -0400 |
commit | 470cd0c5fe6337b6cb5276b3f84400999450fc1b (patch) | |
tree | 687a9fce3b8cb3c6eb971e56652b4cb4ca9c5825 /libavcodec/truemotion2rt.c | |
parent | cc58656aca95b5ab517989a9524b9a2b1c5653cf (diff) | |
download | ffmpeg-470cd0c5fe6337b6cb5276b3f84400999450fc1b.tar.gz |
Add TrueMotion 2.0 Real Time decoder
Signed-off-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
Diffstat (limited to 'libavcodec/truemotion2rt.c')
-rw-r--r-- | libavcodec/truemotion2rt.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/libavcodec/truemotion2rt.c b/libavcodec/truemotion2rt.c new file mode 100644 index 0000000000..4d398fbd3f --- /dev/null +++ b/libavcodec/truemotion2rt.c @@ -0,0 +1,225 @@ +/* + * Duck TrueMotion 2.0 Real Time decoder + * + * 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 <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include "libavutil/imgutils.h" +#include "libavutil/internal.h" +#include "libavutil/intreadwrite.h" +#include "libavutil/mem.h" + +#define BITSTREAM_READER_LE +#include "avcodec.h" +#include "get_bits.h" +#include "internal.h" + +typedef struct TrueMotion2RTContext { + GetBitContext gb; + int delta_size; + int hscale; +} TrueMotion2RTContext; + +static const int16_t delta_tab2[] = { + 5, -7, 36, -36, +}; + +static const int16_t delta_tab3[] = { + 2, -3, 8, -8, 18, -18, 36, -36, +}; + +static const int16_t delta_tab4[] = { + 1, -1, 2, -3, 8, -8, 18, -18, 36, -36, 54, -54, 96, -96, 144, -144, +}; + +static const int16_t *const delta_tabs[] = { + delta_tab2, delta_tab3, delta_tab4, +}; + +/* Returns the number of bytes consumed from the bytestream, or + * AVERROR_INVALIDDATA if there was an error while decoding the header. */ +static int truemotion2rt_decode_header(AVCodecContext *avctx, AVPacket *avpkt) +{ + TrueMotion2RTContext *s = avctx->priv_data; + int header_size; + uint8_t header_buffer[128] = { 0 }; /* logical maximum header size */ + const uint8_t *buf = avpkt->data; + int size = avpkt->size; + int i; + + if (size < 1) { + av_log(avctx, AV_LOG_ERROR, "input packet too small (%d)\n", size); + return AVERROR_INVALIDDATA; + } + + header_size = ((buf[0] >> 5) | (buf[0] << 3)) & 0x7f; + if (header_size < 10) { + av_log(avctx, AV_LOG_ERROR, "invalid header size (%d)\n", header_size); + return AVERROR_INVALIDDATA; + } + + if (header_size + 1 > size) { + av_log(avctx, AV_LOG_ERROR, "input packet too small (%d)\n", size); + return AVERROR_INVALIDDATA; + } + + /* unscramble the header bytes with a XOR operation */ + for (i = 1; i < header_size; i++) + header_buffer[i - 1] = buf[i] ^ buf[i + 1]; + + s->delta_size = header_buffer[1]; + s->hscale = 1 + !!header_buffer[3]; + if (s->delta_size < 2 || s->delta_size > 4) + return AVERROR_INVALIDDATA; + + avctx->height = AV_RL16(header_buffer + 5); + avctx->width = AV_RL16(header_buffer + 7); + + av_log(avctx, AV_LOG_DEBUG, "Header size: %d\n", header_size); + return header_size; +} + +static int truemotion2rt_decode_frame(AVCodecContext *avctx, void *data, + int *got_frame, AVPacket *avpkt) +{ + TrueMotion2RTContext *s = avctx->priv_data; + AVFrame * const p = data; + GetBitContext *gb = &s->gb; + uint8_t *dst; + int x, y, delta_mode; + int ret; + + ret = truemotion2rt_decode_header(avctx, avpkt); + if (ret < 0) + return ret; + + ret = init_get_bits8(gb, avpkt->data + ret, avpkt->size - ret); + if (ret < 0) + return ret; + + ret = ff_get_buffer(avctx, p, 0); + if (ret < 0) + return ret; + + skip_bits(gb, 32); + delta_mode = s->delta_size - 2; + dst = p->data[0]; + for (y = 0; y < avctx->height; y++) { + int diff = 0; + for (x = 0; x < avctx->width; x += s->hscale) { + diff += delta_tabs[delta_mode][get_bits(gb, s->delta_size)]; + dst[x] = av_clip_uint8((y ? dst[x - p->linesize[0]] : 0) + diff); + } + dst += p->linesize[0]; + } + + if (s->hscale > 1) { + dst = p->data[0]; + for (y = 0; y < avctx->height; y++) { + for (x = 1; x < avctx->width; x += s->hscale) + dst[x] = dst[x - 1]; + dst += p->linesize[0]; + } + } + + dst = p->data[0]; + for (y = 0; y < avctx->height; y++) { + for (x = 0; x < avctx->width; x++) + dst[x] = av_clip_uint8(dst[x] + (dst[x] - 128) / 3); + dst += p->linesize[0]; + } + + dst = p->data[1]; + for (y = 0; y < avctx->height >> 2; y++) { + int diff = 0; + for (x = 0; x < avctx->width >> 2; x += s->hscale) { + diff += delta_tabs[delta_mode][get_bits(gb, s->delta_size)]; + dst[x] = av_clip_uint8((y ? dst[x - p->linesize[1]] : 128) + diff); + } + dst += p->linesize[1]; + } + + if (s->hscale > 1) { + dst = p->data[1]; + for (y = 0; y < avctx->height >> 2; y++) { + for (x = 1; x < avctx->width >> 2; x += s->hscale) + dst[x] = dst[x - 1]; + dst += p->linesize[1]; + } + } + + dst = p->data[1]; + for (y = 0; y < avctx->height >> 2; y++) { + for (x = 0; x < avctx->width >> 2; x++) + dst[x] += (dst[x] - 128) / 8; + dst += p->linesize[1]; + } + + dst = p->data[2]; + for (y = 0; y < avctx->height >> 2; y++) { + int diff = 0; + for (x = 0; x < avctx->width >> 2; x += s->hscale) { + diff += delta_tabs[delta_mode][get_bits(gb, s->delta_size)]; + dst[x] = av_clip_uint8((y ? dst[x - p->linesize[2]] : 128) + diff); + } + dst += p->linesize[2]; + } + + if (s->hscale > 1) { + dst = p->data[2]; + for (y = 0; y < avctx->height >> 2; y++) { + for (x = 1; x < avctx->width >> 2; x += s->hscale) + dst[x] = dst[x - 1]; + dst += p->linesize[2]; + } + } + + dst = p->data[2]; + for (y = 0; y < avctx->height >> 2; y++) { + for (x = 0; x < avctx->width >> 2; x++) + dst[x] += (dst[x] - 128) / 8; + dst += p->linesize[2]; + } + + p->pict_type = AV_PICTURE_TYPE_I; + p->key_frame = 1; + *got_frame = 1; + + return avpkt->size; +} + +static av_cold int truemotion2rt_decode_init(AVCodecContext *avctx) +{ + avctx->pix_fmt = AV_PIX_FMT_YUV410P; + return 0; +} + +AVCodec ff_truemotion2rt_decoder = { + .name = "truemotion2rt", + .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0 Real Time"), + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_TRUEMOTION2RT, + .priv_data_size = sizeof(TrueMotion2RTContext), + .init = truemotion2rt_decode_init, + .decode = truemotion2rt_decode_frame, + .capabilities = AV_CODEC_CAP_DR1, + .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, +}; |