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

/*
 * Quicktime Video (RPZA) Video Decoder
 * Copyright (c) 2003 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
 * QT RPZA Video Decoder by Roberto Togni
 * For more information about the RPZA format, visit:
 *   http://www.pcisys.net/~melanson/codecs/
 *
 * The RPZA decoder outputs RGB555 colorspace data.
 *
 * Note that this decoder reads big endian RGB555 pixel values from the
 * bytestream, arranges them in the host's endian order, and outputs
 * them to the final rendered map in the same host endian order. This is
 * intended behavior as the libavcodec documentation states that RGB555
 * pixels shall be stored in native CPU endianness.
 */

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "libavutil/internal.h"
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"

typedef struct RpzaContext {

    AVCodecContext *avctx;
    AVFrame *frame;

    GetByteContext gb;
} RpzaContext;

#define ADVANCE_BLOCK() \
{ \
    pixel_ptr += 4; \
    if (pixel_ptr >= width) \
    { \
        pixel_ptr = 0; \
        row_ptr += stride * 4; \
    } \
    total_blocks--; \
    if (total_blocks < 0) \
    { \
        av_log(s->avctx, AV_LOG_ERROR, "warning: block counter just went negative (this should not happen)\n"); \
        return; \
    } \
}

static void rpza_decode_stream(RpzaContext *s)
{
    int width = s->avctx->width;
    int stride = s->frame->linesize[0] / 2;
    int row_inc = stride - 4;
    int chunk_size;
    uint16_t colorA = 0, colorB;
    uint16_t color4[4];
    uint16_t ta, tb;
    uint16_t *pixels = (uint16_t *)s->frame->data[0];

    int row_ptr = 0;
    int pixel_ptr = -4;
    int block_ptr;
    int pixel_x, pixel_y;
    int total_blocks;

    /* First byte is always 0xe1. Warn if it's different */
    if (bytestream2_peek_byte(&s->gb) != 0xe1)
        av_log(s->avctx, AV_LOG_ERROR, "First chunk byte is 0x%02x instead of 0xe1\n",
               bytestream2_peek_byte(&s->gb));

    /* Get chunk size, ingnoring first byte */
    chunk_size = bytestream2_get_be32(&s->gb) & 0x00FFFFFF;

    /* If length mismatch use size from MOV file and try to decode anyway */
    if (chunk_size != bytestream2_get_bytes_left(&s->gb) + 4)
        av_log(s->avctx, AV_LOG_WARNING,
               "MOV chunk size %d != encoded chunk size %d\n",
               chunk_size,
               bytestream2_get_bytes_left(&s->gb) + 4
              );

    /* Number of 4x4 blocks in frame. */
    total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4);

    /* Process chunk data */
    while (bytestream2_get_bytes_left(&s->gb)) {
        uint8_t opcode = bytestream2_get_byte(&s->gb); /* Get opcode */

        int n_blocks = (opcode & 0x1f) + 1; /* Extract block counter from opcode */

        /* If opcode MSbit is 0, we need more data to decide what to do */
        if ((opcode & 0x80) == 0) {
            colorA = (opcode << 8) | bytestream2_get_byte(&s->gb);
            opcode = 0;
            if ((bytestream2_peek_byte(&s->gb) & 0x80) != 0) {
                /* Must behave as opcode 110xxxxx, using colorA computed
                 * above. Use fake opcode 0x20 to enter switch block at
                 * the right place */
                opcode = 0x20;
                n_blocks = 1;
            }
        }

        n_blocks = FFMIN(n_blocks, total_blocks);

        switch (opcode & 0xe0) {

        /* Skip blocks */
        case 0x80:
            while (n_blocks--) {
              ADVANCE_BLOCK();
            }
            break;

        /* Fill blocks with one color */
        case 0xa0:
            colorA = bytestream2_get_be16(&s->gb);
            while (n_blocks--) {
                ADVANCE_BLOCK()
                block_ptr = row_ptr + pixel_ptr;
                for (pixel_y = 0; pixel_y < 4; pixel_y++) {
                    for (pixel_x = 0; pixel_x < 4; pixel_x++){
                        pixels[block_ptr] = colorA;
                        block_ptr++;
                    }
                    block_ptr += row_inc;
                }
            }
            break;

        /* Fill blocks with 4 colors */
        case 0xc0:
            colorA = bytestream2_get_be16(&s->gb);
        case 0x20:
            colorB = bytestream2_get_be16(&s->gb);

            /* sort out the colors */
            color4[0] = colorB;
            color4[1] = 0;
            color4[2] = 0;
            color4[3] = colorA;

            /* red components */
            ta = (colorA >> 10) & 0x1F;
            tb = (colorB >> 10) & 0x1F;
            color4[1] |= ((11 * ta + 21 * tb) >> 5) << 10;
            color4[2] |= ((21 * ta + 11 * tb) >> 5) << 10;

            /* green components */
            ta = (colorA >> 5) & 0x1F;
            tb = (colorB >> 5) & 0x1F;
            color4[1] |= ((11 * ta + 21 * tb) >> 5) << 5;
            color4[2] |= ((21 * ta + 11 * tb) >> 5) << 5;

            /* blue components */
            ta = colorA & 0x1F;
            tb = colorB & 0x1F;
            color4[1] |= ((11 * ta + 21 * tb) >> 5);
            color4[2] |= ((21 * ta + 11 * tb) >> 5);

            if (bytestream2_get_bytes_left(&s->gb) < n_blocks * 4)
                return;
            while (n_blocks--) {
                ADVANCE_BLOCK();
                block_ptr = row_ptr + pixel_ptr;
                for (pixel_y = 0; pixel_y < 4; pixel_y++) {
                    uint8_t index = bytestream2_get_byteu(&s->gb);
                    for (pixel_x = 0; pixel_x < 4; pixel_x++){
                        uint8_t idx = (index >> (2 * (3 - pixel_x))) & 0x03;
                        pixels[block_ptr] = color4[idx];
                        block_ptr++;
                    }
                    block_ptr += row_inc;
                }
            }
            break;

        /* Fill block with 16 colors */
        case 0x00:
            if (bytestream2_get_bytes_left(&s->gb) < 30)
                return;
            ADVANCE_BLOCK();
            block_ptr = row_ptr + pixel_ptr;
            for (pixel_y = 0; pixel_y < 4; pixel_y++) {
                for (pixel_x = 0; pixel_x < 4; pixel_x++){
                    /* We already have color of upper left pixel */
                    if ((pixel_y != 0) || (pixel_x != 0))
                        colorA = bytestream2_get_be16u(&s->gb);
                    pixels[block_ptr] = colorA;
                    block_ptr++;
                }
                block_ptr += row_inc;
            }
            break;

        /* Unknown opcode */
        default:
            av_log(s->avctx, AV_LOG_ERROR, "Unknown opcode %d in rpza chunk."
                 " Skip remaining %d bytes of chunk data.\n", opcode,
                 bytestream2_get_bytes_left(&s->gb));
            return;
        } /* Opcode switch */
    }
}

static av_cold int rpza_decode_init(AVCodecContext *avctx)
{
    RpzaContext *s = avctx->priv_data;

    s->avctx = avctx;
    avctx->pix_fmt = AV_PIX_FMT_RGB555;

    s->frame = av_frame_alloc();
    if (!s->frame)
        return AVERROR(ENOMEM);

    return 0;
}

static int rpza_decode_frame(AVCodecContext *avctx,
                             void *data, int *got_frame,
                             AVPacket *avpkt)
{
    RpzaContext *s = avctx->priv_data;
    int ret;

    bytestream2_init(&s->gb, avpkt->data, avpkt->size);

    if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
        return ret;

    rpza_decode_stream(s);

    if ((ret = av_frame_ref(data, s->frame)) < 0)
        return ret;

    *got_frame      = 1;

    /* always report that the buffer was completely consumed */
    return avpkt->size;
}

static av_cold int rpza_decode_end(AVCodecContext *avctx)
{
    RpzaContext *s = avctx->priv_data;

    av_frame_free(&s->frame);

    return 0;
}

AVCodec ff_rpza_decoder = {
    .name           = "rpza",
    .long_name      = NULL_IF_CONFIG_SMALL("QuickTime video (RPZA)"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_RPZA,
    .priv_data_size = sizeof(RpzaContext),
    .init           = rpza_decode_init,
    .close          = rpza_decode_end,
    .decode         = rpza_decode_frame,
    .capabilities   = CODEC_CAP_DR1,
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* Quicktime Video (RPZA) Video Decoder
	3	* Copyright (c) 2003 The FFmpeg Project
	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 Street, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
	22	/**
	23	* @file
	24	* QT RPZA Video Decoder by Roberto Togni
	25	* For more information about the RPZA format, visit:
	26	* http://www.pcisys.net/~melanson/codecs/
	27	*
	28	* The RPZA decoder outputs RGB555 colorspace data.
	29	*
	30	* Note that this decoder reads big endian RGB555 pixel values from the
	31	* bytestream, arranges them in the host's endian order, and outputs
	32	* them to the final rendered map in the same host endian order. This is
	33	* intended behavior as the libavcodec documentation states that RGB555
	34	* pixels shall be stored in native CPU endianness.
	35	*/
	36
	37	#include <stdint.h>
	38	#include <stdio.h>
	39	#include <stdlib.h>
	40	#include <string.h>
	41
	42	#include "libavutil/internal.h"
	43	#include "avcodec.h"
	44	#include "bytestream.h"
	45	#include "internal.h"
	46
	47	typedef struct RpzaContext {
	48
	49	AVCodecContext *avctx;
	50	AVFrame *frame;
	51
	52	GetByteContext gb;
	53	} RpzaContext;
	54
	55	#define ADVANCE_BLOCK() \
	56	{ \
	57	pixel_ptr += 4; \
	58	if (pixel_ptr >= width) \
	59	{ \
	60	pixel_ptr = 0; \
	61	row_ptr += stride * 4; \
	62	} \
	63	total_blocks--; \
	64	if (total_blocks < 0) \
65	{ \
66	av_log(s->avctx, AV_LOG_ERROR, "warning: block counter just went negative (this should not happen)\n"); \
67	return; \
68	} \
69	}
70
71	static void rpza_decode_stream(RpzaContext *s)
72	{
73	int width = s->avctx->width;
74	int stride = s->frame->linesize[0] / 2;
75	int row_inc = stride - 4;
76	int chunk_size;
77	uint16_t colorA = 0, colorB;
78	uint16_t color4[4];
79	uint16_t ta, tb;
80	uint16_t pixels = (uint16_t )s->frame->data[0];
81
82	int row_ptr = 0;
83	int pixel_ptr = -4;
84	int block_ptr;
85	int pixel_x, pixel_y;
86	int total_blocks;
87
88	/* First byte is always 0xe1. Warn if it's different */
89	if (bytestream2_peek_byte(&s->gb) != 0xe1)
90	av_log(s->avctx, AV_LOG_ERROR, "First chunk byte is 0x%02x instead of 0xe1\n",
91	bytestream2_peek_byte(&s->gb));
92
93	/* Get chunk size, ingnoring first byte */
94	chunk_size = bytestream2_get_be32(&s->gb) & 0x00FFFFFF;
95
96	/* If length mismatch use size from MOV file and try to decode anyway */
97	if (chunk_size != bytestream2_get_bytes_left(&s->gb) + 4)
98	av_log(s->avctx, AV_LOG_WARNING,
99	"MOV chunk size %d != encoded chunk size %d\n",
100	chunk_size,
101	bytestream2_get_bytes_left(&s->gb) + 4
102	);
103
104	/* Number of 4x4 blocks in frame. */
105	total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4);
106
107	/* Process chunk data */
108	while (bytestream2_get_bytes_left(&s->gb)) {
109	uint8_t opcode = bytestream2_get_byte(&s->gb); /* Get opcode */
110
111	int n_blocks = (opcode & 0x1f) + 1; /* Extract block counter from opcode */
112
113	/* If opcode MSbit is 0, we need more data to decide what to do */
114	if ((opcode & 0x80) == 0) {
115	colorA = (opcode << 8) \| bytestream2_get_byte(&s->gb);
116	opcode = 0;
117	if ((bytestream2_peek_byte(&s->gb) & 0x80) != 0) {
118	/* Must behave as opcode 110xxxxx, using colorA computed
119	* above. Use fake opcode 0x20 to enter switch block at
120	* the right place */
121	opcode = 0x20;
122	n_blocks = 1;
123	}
124	}
125
126	n_blocks = FFMIN(n_blocks, total_blocks);
127
128	switch (opcode & 0xe0) {
129
130	/* Skip blocks */
131	case 0x80:
132	while (n_blocks--) {
133	ADVANCE_BLOCK();
134	}
135	break;
136
137	/* Fill blocks with one color */
138	case 0xa0:
139	colorA = bytestream2_get_be16(&s->gb);
140	while (n_blocks--) {
141	ADVANCE_BLOCK()
142	block_ptr = row_ptr + pixel_ptr;
143	for (pixel_y = 0; pixel_y < 4; pixel_y++) {
144	for (pixel_x = 0; pixel_x < 4; pixel_x++){
145	pixels[block_ptr] = colorA;
146	block_ptr++;
147	}
148	block_ptr += row_inc;
149	}
150	}
151	break;
152
153	/* Fill blocks with 4 colors */
154	case 0xc0:
155	colorA = bytestream2_get_be16(&s->gb);
156	case 0x20:
157	colorB = bytestream2_get_be16(&s->gb);
158
159	/* sort out the colors */
160	color4[0] = colorB;
161	color4[1] = 0;
162	color4[2] = 0;
163	color4[3] = colorA;
164
165	/* red components */
166	ta = (colorA >> 10) & 0x1F;
167	tb = (colorB >> 10) & 0x1F;
168	color4[1] \|= ((11 * ta + 21 * tb) >> 5) << 10;
169	color4[2] \|= ((21 * ta + 11 * tb) >> 5) << 10;
170
171	/* green components */
172	ta = (colorA >> 5) & 0x1F;
173	tb = (colorB >> 5) & 0x1F;
174	color4[1] \|= ((11 * ta + 21 * tb) >> 5) << 5;
175	color4[2] \|= ((21 * ta + 11 * tb) >> 5) << 5;
176
177	/* blue components */
178	ta = colorA & 0x1F;
179	tb = colorB & 0x1F;
180	color4[1] \|= ((11 * ta + 21 * tb) >> 5);
181	color4[2] \|= ((21 * ta + 11 * tb) >> 5);
182
183	if (bytestream2_get_bytes_left(&s->gb) < n_blocks * 4)
184	return;
185	while (n_blocks--) {
186	ADVANCE_BLOCK();
187	block_ptr = row_ptr + pixel_ptr;
188	for (pixel_y = 0; pixel_y < 4; pixel_y++) {
189	uint8_t index = bytestream2_get_byteu(&s->gb);
190	for (pixel_x = 0; pixel_x < 4; pixel_x++){
191	uint8_t idx = (index >> (2 * (3 - pixel_x))) & 0x03;
192	pixels[block_ptr] = color4[idx];
193	block_ptr++;
194	}
195	block_ptr += row_inc;
196	}
197	}
198	break;
199
200	/* Fill block with 16 colors */
201	case 0x00:
202	if (bytestream2_get_bytes_left(&s->gb) < 30)
203	return;
204	ADVANCE_BLOCK();
205	block_ptr = row_ptr + pixel_ptr;
206	for (pixel_y = 0; pixel_y < 4; pixel_y++) {
207	for (pixel_x = 0; pixel_x < 4; pixel_x++){
208	/* We already have color of upper left pixel */
209	if ((pixel_y != 0) \|\| (pixel_x != 0))
210	colorA = bytestream2_get_be16u(&s->gb);
211	pixels[block_ptr] = colorA;
212	block_ptr++;
213	}
214	block_ptr += row_inc;
215	}
216	break;
217
218	/* Unknown opcode */
219	default:
220	av_log(s->avctx, AV_LOG_ERROR, "Unknown opcode %d in rpza chunk."
221	" Skip remaining %d bytes of chunk data.\n", opcode,
222	bytestream2_get_bytes_left(&s->gb));
223	return;
224	} /* Opcode switch */
225	}
226	}
227
228	static av_cold int rpza_decode_init(AVCodecContext *avctx)
229	{
230	RpzaContext *s = avctx->priv_data;
231
232	s->avctx = avctx;
233	avctx->pix_fmt = AV_PIX_FMT_RGB555;
234
235	s->frame = av_frame_alloc();
236	if (!s->frame)
237	return AVERROR(ENOMEM);
238
239	return 0;
240	}
241
242	static int rpza_decode_frame(AVCodecContext *avctx,
243	void data, int got_frame,
244	AVPacket *avpkt)
245	{
246	RpzaContext *s = avctx->priv_data;
247	int ret;
248
249	bytestream2_init(&s->gb, avpkt->data, avpkt->size);
250
251	if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
252	return ret;
253
254	rpza_decode_stream(s);
255
256	if ((ret = av_frame_ref(data, s->frame)) < 0)
257	return ret;
258
259	*got_frame = 1;
260
261	/* always report that the buffer was completely consumed */
262	return avpkt->size;
263	}
264
265	static av_cold int rpza_decode_end(AVCodecContext *avctx)
266	{
267	RpzaContext *s = avctx->priv_data;
268
269	av_frame_free(&s->frame);
270
271	return 0;
272	}
273
274	AVCodec ff_rpza_decoder = {
275	.name = "rpza",
276	.long_name = NULL_IF_CONFIG_SMALL("QuickTime video (RPZA)"),
277	.type = AVMEDIA_TYPE_VIDEO,
278	.id = AV_CODEC_ID_RPZA,
279	.priv_data_size = sizeof(RpzaContext),
280	.init = rpza_decode_init,
281	.close = rpza_decode_end,
282	.decode = rpza_decode_frame,
283	.capabilities = CODEC_CAP_DR1,
284	};