[deb_ffmpeg.git] / ffmpeg / libavcodec / eacmv.c

/*
 * Electronic Arts CMV Video Decoder
 * Copyright (c) 2007-2008 Peter Ross
 *
 * 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 St, Fifth Floor, Boston, MA  02110-1301  USA
 */

/**
 * @file
 * Electronic Arts CMV Video Decoder
 * by Peter Ross (pross@xvid.org)
 *
 * Technical details here:
 * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_CMV
 */

#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "internal.h"

typedef struct CmvContext {
    AVCodecContext *avctx;
    AVFrame *last_frame;   ///< last
    AVFrame *last2_frame;  ///< second-last
    int width, height;
    unsigned int palette[AVPALETTE_COUNT];
} CmvContext;

static av_cold int cmv_decode_init(AVCodecContext *avctx){
    CmvContext *s = avctx->priv_data;

    s->avctx = avctx;
    avctx->pix_fmt = AV_PIX_FMT_PAL8;

    s->last_frame  = av_frame_alloc();
    s->last2_frame = av_frame_alloc();
    if (!s->last_frame || !s->last2_frame) {
        av_frame_free(&s->last_frame);
        av_frame_free(&s->last2_frame);
        return AVERROR(ENOMEM);
    }

    return 0;
}

static void cmv_decode_intra(CmvContext * s, AVFrame *frame,
                             const uint8_t *buf, const uint8_t *buf_end)
{
    unsigned char *dst = frame->data[0];
    int i;

    for (i=0; i < s->avctx->height && buf_end - buf >= s->avctx->width; i++) {
        memcpy(dst, buf, s->avctx->width);
        dst += frame->linesize[0];
        buf += s->avctx->width;
    }
}

static void cmv_motcomp(unsigned char *dst, int dst_stride,
                        const unsigned char *src, int src_stride,
                        int x, int y,
                        int xoffset, int yoffset,
                        int width, int height){
    int i,j;

    for(j=y;j<y+4;j++)
    for(i=x;i<x+4;i++)
    {
        if (i+xoffset>=0 && i+xoffset<width &&
            j+yoffset>=0 && j+yoffset<height) {
            dst[j*dst_stride + i] = src[(j+yoffset)*src_stride + i+xoffset];
        }else{
            dst[j*dst_stride + i] = 0;
        }
    }
}

static void cmv_decode_inter(CmvContext *s, AVFrame *frame, const uint8_t *buf,
                             const uint8_t *buf_end)
{
    const uint8_t *raw = buf + (s->avctx->width*s->avctx->height/16);
    int x,y,i;

    i = 0;
    for(y=0; y<s->avctx->height/4; y++)
    for(x=0; x<s->avctx->width/4 && buf_end - buf > i; x++) {
        if (buf[i]==0xFF) {
            unsigned char *dst = frame->data[0] + (y*4)*frame->linesize[0] + x*4;
            if (raw+16<buf_end && *raw==0xFF) { /* intra */
                raw++;
                memcpy(dst, raw, 4);
                memcpy(dst +     frame->linesize[0], raw+4, 4);
                memcpy(dst + 2 * frame->linesize[0], raw+8, 4);
                memcpy(dst + 3 * frame->linesize[0], raw+12, 4);
                raw+=16;
            }else if(raw<buf_end) {  /* inter using second-last frame as reference */
                int xoffset = (*raw & 0xF) - 7;
                int yoffset = ((*raw >> 4)) - 7;
                if (s->last2_frame->data[0])
                    cmv_motcomp(frame->data[0], frame->linesize[0],
                                s->last2_frame->data[0], s->last2_frame->linesize[0],
                                x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height);
                raw++;
            }
        }else{  /* inter using last frame as reference */
            int xoffset = (buf[i] & 0xF) - 7;
            int yoffset = ((buf[i] >> 4)) - 7;
            if (s->last_frame->data[0])
                cmv_motcomp(frame->data[0], frame->linesize[0],
                            s->last_frame->data[0], s->last_frame->linesize[0],
                            x*4, y*4, xoffset, yoffset, s->avctx->width, s->avctx->height);
        }
        i++;
    }
}

static int cmv_process_header(CmvContext *s, const uint8_t *buf, const uint8_t *buf_end)
{
    int pal_start, pal_count, i, ret, fps;

    if(buf_end - buf < 16) {
        av_log(s->avctx, AV_LOG_WARNING, "truncated header\n");
        return AVERROR_INVALIDDATA;
    }

    s->width  = AV_RL16(&buf[4]);
    s->height = AV_RL16(&buf[6]);

    if (s->width  != s->avctx->width ||
        s->height != s->avctx->height) {
        av_frame_unref(s->last_frame);
        av_frame_unref(s->last2_frame);
    }

    ret = ff_set_dimensions(s->avctx, s->width, s->height);
    if (ret < 0)
        return ret;

    fps = AV_RL16(&buf[10]);
    if (fps > 0)
        s->avctx->framerate = (AVRational){ fps, 1 };

    pal_start = AV_RL16(&buf[12]);
    pal_count = AV_RL16(&buf[14]);

    buf += 16;
    for (i=pal_start; i<pal_start+pal_count && i<AVPALETTE_COUNT && buf_end - buf >= 3; i++) {
        s->palette[i] = 0xFFU << 24 | AV_RB24(buf);
        buf += 3;
    }

    return 0;
}

#define EA_PREAMBLE_SIZE 8
#define MVIh_TAG MKTAG('M', 'V', 'I', 'h')

static int cmv_decode_frame(AVCodecContext *avctx,
                            void *data, int *got_frame,
                            AVPacket *avpkt)
{
    const uint8_t *buf = avpkt->data;
    int buf_size = avpkt->size;
    CmvContext *s = avctx->priv_data;
    const uint8_t *buf_end = buf + buf_size;
    AVFrame *frame = data;
    int ret;

    if (buf_end - buf < EA_PREAMBLE_SIZE)
        return AVERROR_INVALIDDATA;

    if (AV_RL32(buf)==MVIh_TAG||AV_RB32(buf)==MVIh_TAG) {
        unsigned size = AV_RL32(buf + 4);
        ret = cmv_process_header(s, buf+EA_PREAMBLE_SIZE, buf_end);
        if (ret < 0)
            return ret;
        if (size > buf_end - buf - EA_PREAMBLE_SIZE)
            return -1;
        buf += size;
    }

    if (av_image_check_size(s->width, s->height, 0, s->avctx))
        return -1;

    if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
        return ret;

    memcpy(frame->data[1], s->palette, AVPALETTE_SIZE);

    buf += EA_PREAMBLE_SIZE;
    if ((buf[0]&1)) {  // subtype
        cmv_decode_inter(s, frame, buf+2, buf_end);
        frame->key_frame = 0;
        frame->pict_type = AV_PICTURE_TYPE_P;
    }else{
        frame->key_frame = 1;
        frame->pict_type = AV_PICTURE_TYPE_I;
        cmv_decode_intra(s, frame, buf+2, buf_end);
    }

    av_frame_unref(s->last2_frame);
    av_frame_move_ref(s->last2_frame, s->last_frame);
    if ((ret = av_frame_ref(s->last_frame, frame)) < 0)
        return ret;

    *got_frame = 1;

    return buf_size;
}

static av_cold int cmv_decode_end(AVCodecContext *avctx){
    CmvContext *s = avctx->priv_data;

    av_frame_free(&s->last_frame);
    av_frame_free(&s->last2_frame);

    return 0;
}

AVCodec ff_eacmv_decoder = {
    .name           = "eacmv",
    .long_name      = NULL_IF_CONFIG_SMALL("Electronic Arts CMV video"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_CMV,
    .priv_data_size = sizeof(CmvContext),
    .init           = cmv_decode_init,
    .close          = cmv_decode_end,
    .decode         = cmv_decode_frame,
    .capabilities   = CODEC_CAP_DR1,
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* Electronic Arts CMV Video Decoder
	3	* Copyright (c) 2007-2008 Peter Ross
	4	*
	5	* This file is part of FFmpeg.
	6	*
	7	* FFmpeg is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU Lesser General Public
	9	* License as published by the Free Software Foundation; either
	10	* version 2.1 of the License, or (at your option) any later version.
	11	*
	12	* FFmpeg is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public
	18	* License along with FFmpeg; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
	22	/**
	23	* @file
	24	* Electronic Arts CMV Video Decoder
	25	* by Peter Ross (pross@xvid.org)
	26	*
	27	* Technical details here:
	28	* http://wiki.multimedia.cx/index.php?title=Electronic_Arts_CMV
	29	*/
	30
	31	#include "libavutil/common.h"
	32	#include "libavutil/intreadwrite.h"
	33	#include "libavutil/imgutils.h"
	34	#include "avcodec.h"
	35	#include "internal.h"
	36
	37	typedef struct CmvContext {
	38	AVCodecContext *avctx;
	39	AVFrame *last_frame; ///< last
	40	AVFrame *last2_frame; ///< second-last
	41	int width, height;
	42	unsigned int palette[AVPALETTE_COUNT];
	43	} CmvContext;
	44
	45	static av_cold int cmv_decode_init(AVCodecContext *avctx){
	46	CmvContext *s = avctx->priv_data;
	47
	48	s->avctx = avctx;
	49	avctx->pix_fmt = AV_PIX_FMT_PAL8;
	50
	51	s->last_frame = av_frame_alloc();
	52	s->last2_frame = av_frame_alloc();
	53	if (!s->last_frame \|\| !s->last2_frame) {
	54	av_frame_free(&s->last_frame);
	55	av_frame_free(&s->last2_frame);
	56	return AVERROR(ENOMEM);
	57	}
	58
	59	return 0;
	60	}
	61
	62	static void cmv_decode_intra(CmvContext * s, AVFrame *frame,
	63	const uint8_t buf, const uint8_t buf_end)
	64	{
65	unsigned char *dst = frame->data[0];
66	int i;
67
68	for (i=0; i < s->avctx->height && buf_end - buf >= s->avctx->width; i++) {
69	memcpy(dst, buf, s->avctx->width);
70	dst += frame->linesize[0];
71	buf += s->avctx->width;
72	}
73	}
74
75	static void cmv_motcomp(unsigned char *dst, int dst_stride,
76	const unsigned char *src, int src_stride,
77	int x, int y,
78	int xoffset, int yoffset,
79	int width, int height){
80	int i,j;
81
82	for(j=y;j<y+4;j++)
83	for(i=x;i<x+4;i++)
84	{
85	if (i+xoffset>=0 && i+xoffset<width &&
86	j+yoffset>=0 && j+yoffset<height) {
87	dst[jdst_stride + i] = src[(j+yoffset)src_stride + i+xoffset];
88	}else{
89	dst[j*dst_stride + i] = 0;
90	}
91	}
92	}
93
94	static void cmv_decode_inter(CmvContext s, AVFrame frame, const uint8_t *buf,
95	const uint8_t *buf_end)
96	{
97	const uint8_t raw = buf + (s->avctx->widths->avctx->height/16);
98	int x,y,i;
99
100	i = 0;
101	for(y=0; y<s->avctx->height/4; y++)
102	for(x=0; x<s->avctx->width/4 && buf_end - buf > i; x++) {
103	if (buf[i]==0xFF) {
104	unsigned char dst = frame->data[0] + (y4)frame->linesize[0] + x4;
105	if (raw+16<buf_end && raw==0xFF) { / intra */
106	raw++;
107	memcpy(dst, raw, 4);
108	memcpy(dst + frame->linesize[0], raw+4, 4);
109	memcpy(dst + 2 * frame->linesize[0], raw+8, 4);
110	memcpy(dst + 3 * frame->linesize[0], raw+12, 4);
111	raw+=16;
112	}else if(raw<buf_end) { /* inter using second-last frame as reference */
113	int xoffset = (*raw & 0xF) - 7;
114	int yoffset = ((*raw >> 4)) - 7;
115	if (s->last2_frame->data[0])
116	cmv_motcomp(frame->data[0], frame->linesize[0],
117	s->last2_frame->data[0], s->last2_frame->linesize[0],
118	x4, y4, xoffset, yoffset, s->avctx->width, s->avctx->height);
119	raw++;
120	}
121	}else{ /* inter using last frame as reference */
122	int xoffset = (buf[i] & 0xF) - 7;
123	int yoffset = ((buf[i] >> 4)) - 7;
124	if (s->last_frame->data[0])
125	cmv_motcomp(frame->data[0], frame->linesize[0],
126	s->last_frame->data[0], s->last_frame->linesize[0],
127	x4, y4, xoffset, yoffset, s->avctx->width, s->avctx->height);
128	}
129	i++;
130	}
131	}
132
133	static int cmv_process_header(CmvContext s, const uint8_t buf, const uint8_t *buf_end)
134	{
135	int pal_start, pal_count, i, ret, fps;
136
137	if(buf_end - buf < 16) {
138	av_log(s->avctx, AV_LOG_WARNING, "truncated header\n");
139	return AVERROR_INVALIDDATA;
140	}
141
142	s->width = AV_RL16(&buf[4]);
143	s->height = AV_RL16(&buf[6]);
144
145	if (s->width != s->avctx->width \|\|
146	s->height != s->avctx->height) {
147	av_frame_unref(s->last_frame);
148	av_frame_unref(s->last2_frame);
149	}
150
151	ret = ff_set_dimensions(s->avctx, s->width, s->height);
152	if (ret < 0)
153	return ret;
154
155	fps = AV_RL16(&buf[10]);
156	if (fps > 0)
f6fa7814	157	s->avctx->framerate = (AVRational){ fps, 1 };
2ba45a60 DM	158
	159	pal_start = AV_RL16(&buf[12]);
	160	pal_count = AV_RL16(&buf[14]);
	161
	162	buf += 16;
	163	for (i=pal_start; i<pal_start+pal_count && i<AVPALETTE_COUNT && buf_end - buf >= 3; i++) {
	164	s->palette[i] = 0xFFU << 24 \| AV_RB24(buf);
	165	buf += 3;
	166	}
	167
	168	return 0;
	169	}
	170
	171	#define EA_PREAMBLE_SIZE 8
	172	#define MVIh_TAG MKTAG('M', 'V', 'I', 'h')
	173
	174	static int cmv_decode_frame(AVCodecContext *avctx,
	175	void data, int got_frame,
	176	AVPacket *avpkt)
	177	{
	178	const uint8_t *buf = avpkt->data;
	179	int buf_size = avpkt->size;
	180	CmvContext *s = avctx->priv_data;
	181	const uint8_t *buf_end = buf + buf_size;
	182	AVFrame *frame = data;
	183	int ret;
	184
	185	if (buf_end - buf < EA_PREAMBLE_SIZE)
	186	return AVERROR_INVALIDDATA;
	187
	188	if (AV_RL32(buf)==MVIh_TAG\|\|AV_RB32(buf)==MVIh_TAG) {
	189	unsigned size = AV_RL32(buf + 4);
	190	ret = cmv_process_header(s, buf+EA_PREAMBLE_SIZE, buf_end);
	191	if (ret < 0)
	192	return ret;
	193	if (size > buf_end - buf - EA_PREAMBLE_SIZE)
	194	return -1;
	195	buf += size;
	196	}
	197
	198	if (av_image_check_size(s->width, s->height, 0, s->avctx))
	199	return -1;
	200
	201	if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
	202	return ret;
	203
	204	memcpy(frame->data[1], s->palette, AVPALETTE_SIZE);
	205
	206	buf += EA_PREAMBLE_SIZE;
	207	if ((buf[0]&1)) { // subtype
	208	cmv_decode_inter(s, frame, buf+2, buf_end);
	209	frame->key_frame = 0;
	210	frame->pict_type = AV_PICTURE_TYPE_P;
	211	}else{
	212	frame->key_frame = 1;
	213	frame->pict_type = AV_PICTURE_TYPE_I;
	214	cmv_decode_intra(s, frame, buf+2, buf_end);
	215	}
	216
	217	av_frame_unref(s->last2_frame);
	218	av_frame_move_ref(s->last2_frame, s->last_frame);
	219	if ((ret = av_frame_ref(s->last_frame, frame)) < 0)
	220	return ret;
	221
222	*got_frame = 1;
223
224	return buf_size;
225	}
226
227	static av_cold int cmv_decode_end(AVCodecContext *avctx){
228	CmvContext *s = avctx->priv_data;
229
230	av_frame_free(&s->last_frame);
231	av_frame_free(&s->last2_frame);
232
233	return 0;
234	}
235
236	AVCodec ff_eacmv_decoder = {
237	.name = "eacmv",
238	.long_name = NULL_IF_CONFIG_SMALL("Electronic Arts CMV video"),
239	.type = AVMEDIA_TYPE_VIDEO,
240	.id = AV_CODEC_ID_CMV,
241	.priv_data_size = sizeof(CmvContext),
242	.init = cmv_decode_init,
243	.close = cmv_decode_end,
244	.decode = cmv_decode_frame,
245	.capabilities = CODEC_CAP_DR1,
246	};