3 * Copyright (c) 2015 Rodger Combs
5 * This file is part of FFmpeg.
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.
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.
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
28 #include <interface/mmal/mmal.h>
29 #include <interface/mmal/mmal_parameters_video.h>
30 #include <interface/mmal/util/mmal_util.h>
31 #include <interface/mmal/util/mmal_util_params.h>
32 #include <interface/mmal/util/mmal_default_components.h>
33 #include <interface/mmal/vc/mmal_vc_api.h>
37 #include "libavutil/atomic.h"
38 #include "libavutil/avassert.h"
39 #include "libavutil/buffer.h"
40 #include "libavutil/common.h"
41 #include "libavutil/opt.h"
42 #include "libavutil/log.h"
44 typedef struct FFBufferEntry {
50 struct FFBufferEntry *next;
53 // MMAL_POOL_T destroys all of its MMAL_BUFFER_HEADER_Ts. If we want correct
54 // refcounting for AVFrames, we can free the MMAL_POOL_T only after all AVFrames
55 // have been unreferenced.
56 typedef struct FFPoolRef {
57 volatile int refcount;
61 typedef struct FFBufferRef {
62 MMAL_BUFFER_HEADER_T *buffer;
66 typedef struct MMALDecodeContext {
70 MMAL_COMPONENT_T *decoder;
71 MMAL_QUEUE_T *queue_decoded_frames;
75 // Waiting input packets. Because the libavcodec API requires decoding and
76 // returning packets in lockstep, it can happen that queue_decoded_frames
77 // contains almost all surfaces - then the decoder input queue can quickly
78 // fill up and won't accept new input either. Without consuming input, the
79 // libavcodec API can't return new frames, and we have a logical deadlock.
80 // This is avoided by queuing such buffers here.
81 FFBufferEntry *waiting_buffers, *waiting_buffers_tail;
84 volatile int packets_buffered;
85 int64_t frames_output;
91 // Assume decoder is guaranteed to produce output after at least this many
92 // packets (where each packet contains 1 frame).
93 #define MAX_DELAYED_FRAMES 16
95 static void ffmmal_poolref_unref(FFPoolRef *ref)
97 if (ref && avpriv_atomic_int_add_and_fetch(&ref->refcount, -1) == 0) {
98 mmal_pool_destroy(ref->pool);
103 static void ffmmal_release_frame(void *opaque, uint8_t *data)
105 FFBufferRef *ref = (void *)data;
107 mmal_buffer_header_release(ref->buffer);
108 ffmmal_poolref_unref(ref->pool);
113 // Setup frame with a new reference to buffer. The buffer must have been
114 // allocated from the given pool.
115 static int ffmmal_set_ref(AVFrame *frame, FFPoolRef *pool,
116 MMAL_BUFFER_HEADER_T *buffer)
118 FFBufferRef *ref = av_mallocz(sizeof(*ref));
120 return AVERROR(ENOMEM);
123 ref->buffer = buffer;
125 frame->buf[0] = av_buffer_create((void *)ref, sizeof(*ref),
126 ffmmal_release_frame, NULL,
127 AV_BUFFER_FLAG_READONLY);
128 if (!frame->buf[0]) {
130 return AVERROR(ENOMEM);
133 avpriv_atomic_int_add_and_fetch(&ref->pool->refcount, 1);
134 mmal_buffer_header_acquire(buffer);
136 frame->format = AV_PIX_FMT_MMAL;
137 frame->data[3] = (uint8_t *)ref->buffer;
141 static void ffmmal_stop_decoder(AVCodecContext *avctx)
143 MMALDecodeContext *ctx = avctx->priv_data;
144 MMAL_COMPONENT_T *decoder = ctx->decoder;
145 MMAL_BUFFER_HEADER_T *buffer;
147 mmal_port_disable(decoder->input[0]);
148 mmal_port_disable(decoder->output[0]);
149 mmal_port_disable(decoder->control);
151 mmal_port_flush(decoder->input[0]);
152 mmal_port_flush(decoder->output[0]);
153 mmal_port_flush(decoder->control);
155 while ((buffer = mmal_queue_get(ctx->queue_decoded_frames)))
156 mmal_buffer_header_release(buffer);
158 while (ctx->waiting_buffers) {
159 FFBufferEntry *buffer = ctx->waiting_buffers;
161 ctx->waiting_buffers = buffer->next;
163 if (buffer->flags & MMAL_BUFFER_HEADER_FLAG_FRAME_END)
164 avpriv_atomic_int_add_and_fetch(&ctx->packets_buffered, -1);
166 av_buffer_unref(&buffer->ref);
169 ctx->waiting_buffers_tail = NULL;
171 av_assert0(avpriv_atomic_int_get(&ctx->packets_buffered) == 0);
173 ctx->frames_output = ctx->eos_received = ctx->eos_sent = ctx->packets_sent = ctx->extradata_sent = 0;
176 static av_cold int ffmmal_close_decoder(AVCodecContext *avctx)
178 MMALDecodeContext *ctx = avctx->priv_data;
181 ffmmal_stop_decoder(avctx);
183 mmal_component_destroy(ctx->decoder);
185 mmal_queue_destroy(ctx->queue_decoded_frames);
186 mmal_pool_destroy(ctx->pool_in);
187 ffmmal_poolref_unref(ctx->pool_out);
194 static void input_callback(MMAL_PORT_T *port, MMAL_BUFFER_HEADER_T *buffer)
196 AVCodecContext *avctx = (AVCodecContext*)port->userdata;
197 MMALDecodeContext *ctx = avctx->priv_data;
200 FFBufferEntry *entry = buffer->user_data;
201 av_buffer_unref(&entry->ref);
202 if (entry->flags & MMAL_BUFFER_HEADER_FLAG_FRAME_END)
203 avpriv_atomic_int_add_and_fetch(&ctx->packets_buffered, -1);
206 mmal_buffer_header_release(buffer);
209 static void output_callback(MMAL_PORT_T *port, MMAL_BUFFER_HEADER_T *buffer)
211 AVCodecContext *avctx = (AVCodecContext*)port->userdata;
212 MMALDecodeContext *ctx = avctx->priv_data;
214 mmal_queue_put(ctx->queue_decoded_frames, buffer);
217 static void control_port_cb(MMAL_PORT_T *port, MMAL_BUFFER_HEADER_T *buffer)
219 AVCodecContext *avctx = (AVCodecContext*)port->userdata;
220 MMAL_STATUS_T status;
222 if (buffer->cmd == MMAL_EVENT_ERROR) {
223 status = *(uint32_t *)buffer->data;
224 av_log(avctx, AV_LOG_ERROR, "MMAL error %d on control port\n", (int)status);
227 av_get_codec_tag_string(s, sizeof(s), buffer->cmd);
228 av_log(avctx, AV_LOG_WARNING, "Unknown MMAL event %s on control port\n", s);
231 mmal_buffer_header_release(buffer);
234 // Feed free output buffers to the decoder.
235 static int ffmmal_fill_output_port(AVCodecContext *avctx)
237 MMALDecodeContext *ctx = avctx->priv_data;
238 MMAL_BUFFER_HEADER_T *buffer;
239 MMAL_STATUS_T status;
242 return AVERROR_UNKNOWN; // format change code failed with OOM previously
244 while ((buffer = mmal_queue_get(ctx->pool_out->pool->queue))) {
245 if ((status = mmal_port_send_buffer(ctx->decoder->output[0], buffer))) {
246 mmal_buffer_header_release(buffer);
247 av_log(avctx, AV_LOG_ERROR, "MMAL error %d when sending output buffer.\n", (int)status);
248 return AVERROR_UNKNOWN;
255 static enum AVColorSpace ffmmal_csp_to_av_csp(MMAL_FOURCC_T fourcc)
258 case MMAL_COLOR_SPACE_BT470_2_BG:
259 case MMAL_COLOR_SPACE_BT470_2_M:
260 case MMAL_COLOR_SPACE_ITUR_BT601: return AVCOL_SPC_BT470BG;
261 case MMAL_COLOR_SPACE_ITUR_BT709: return AVCOL_SPC_BT709;
262 case MMAL_COLOR_SPACE_FCC: return AVCOL_SPC_FCC;
263 case MMAL_COLOR_SPACE_SMPTE240M: return AVCOL_SPC_SMPTE240M;
264 default: return AVCOL_SPC_UNSPECIFIED;
268 static int ffmal_update_format(AVCodecContext *avctx)
270 MMALDecodeContext *ctx = avctx->priv_data;
271 MMAL_STATUS_T status;
273 MMAL_COMPONENT_T *decoder = ctx->decoder;
274 MMAL_ES_FORMAT_T *format_out = decoder->output[0]->format;
276 ffmmal_poolref_unref(ctx->pool_out);
277 if (!(ctx->pool_out = av_mallocz(sizeof(*ctx->pool_out)))) {
278 ret = AVERROR(ENOMEM);
281 ctx->pool_out->refcount = 1;
286 if ((status = mmal_port_parameter_set_uint32(decoder->output[0], MMAL_PARAMETER_EXTRA_BUFFERS, ctx->extra_buffers)))
289 if ((status = mmal_port_parameter_set_boolean(decoder->output[0], MMAL_PARAMETER_VIDEO_INTERPOLATE_TIMESTAMPS, 0)))
292 if (avctx->pix_fmt == AV_PIX_FMT_MMAL) {
293 format_out->encoding = MMAL_ENCODING_OPAQUE;
295 format_out->encoding_variant = format_out->encoding = MMAL_ENCODING_I420;
298 if ((status = mmal_port_format_commit(decoder->output[0])))
301 if ((ret = ff_set_dimensions(avctx, format_out->es->video.crop.x + format_out->es->video.crop.width,
302 format_out->es->video.crop.y + format_out->es->video.crop.height)) < 0)
305 if (format_out->es->video.par.num && format_out->es->video.par.den) {
306 avctx->sample_aspect_ratio.num = format_out->es->video.par.num;
307 avctx->sample_aspect_ratio.den = format_out->es->video.par.den;
310 avctx->colorspace = ffmmal_csp_to_av_csp(format_out->es->video.color_space);
312 decoder->output[0]->buffer_size =
313 FFMAX(decoder->output[0]->buffer_size_min, decoder->output[0]->buffer_size_recommended);
314 decoder->output[0]->buffer_num =
315 FFMAX(decoder->output[0]->buffer_num_min, decoder->output[0]->buffer_num_recommended) + ctx->extra_buffers;
316 ctx->pool_out->pool = mmal_pool_create(decoder->output[0]->buffer_num,
317 decoder->output[0]->buffer_size);
318 if (!ctx->pool_out->pool) {
319 ret = AVERROR(ENOMEM);
326 return ret < 0 ? ret : AVERROR_UNKNOWN;
329 static av_cold int ffmmal_init_decoder(AVCodecContext *avctx)
331 MMALDecodeContext *ctx = avctx->priv_data;
332 MMAL_STATUS_T status;
333 MMAL_ES_FORMAT_T *format_in;
334 MMAL_COMPONENT_T *decoder;
339 if (mmal_vc_init()) {
340 av_log(avctx, AV_LOG_ERROR, "Cannot initialize MMAL VC driver!\n");
341 return AVERROR(ENOSYS);
344 if ((ret = ff_get_format(avctx, avctx->codec->pix_fmts)) < 0)
347 avctx->pix_fmt = ret;
349 if ((status = mmal_component_create(MMAL_COMPONENT_DEFAULT_VIDEO_DECODER, &ctx->decoder)))
352 decoder = ctx->decoder;
354 format_in = decoder->input[0]->format;
355 format_in->type = MMAL_ES_TYPE_VIDEO;
356 switch (avctx->codec_id) {
357 case AV_CODEC_ID_MPEG2VIDEO:
358 format_in->encoding = MMAL_ENCODING_MP2V;
359 av_log(avctx, AV_LOG_DEBUG, "Use MMAL MP2V encoding\n");
361 case AV_CODEC_ID_VC1:
362 format_in->encoding = MMAL_ENCODING_WVC1;
363 av_log(avctx, AV_LOG_DEBUG, "Use MMAL WVC1 encoding\n");
365 case AV_CODEC_ID_H264:
367 format_in->encoding = MMAL_ENCODING_H264;
368 av_log(avctx, AV_LOG_DEBUG, "Use MMAL H264 encoding\n");
371 format_in->es->video.width = FFALIGN(avctx->width, 32);
372 format_in->es->video.height = FFALIGN(avctx->height, 16);
373 format_in->es->video.crop.width = avctx->width;
374 format_in->es->video.crop.height = avctx->height;
375 format_in->es->video.frame_rate.num = 24000;
376 format_in->es->video.frame_rate.den = 1001;
377 format_in->es->video.par.num = avctx->sample_aspect_ratio.num;
378 format_in->es->video.par.den = avctx->sample_aspect_ratio.den;
379 format_in->flags = MMAL_ES_FORMAT_FLAG_FRAMED;
381 if ((status = mmal_port_format_commit(decoder->input[0])))
384 decoder->input[0]->buffer_num =
385 FFMAX(decoder->input[0]->buffer_num_min, 20);
386 decoder->input[0]->buffer_size =
387 FFMAX(decoder->input[0]->buffer_size_min, 512 * 1024);
388 ctx->pool_in = mmal_pool_create(decoder->input[0]->buffer_num, 0);
390 ret = AVERROR(ENOMEM);
394 if ((ret = ffmal_update_format(avctx)) < 0)
397 ctx->queue_decoded_frames = mmal_queue_create();
398 if (!ctx->queue_decoded_frames)
401 decoder->input[0]->userdata = (void*)avctx;
402 decoder->output[0]->userdata = (void*)avctx;
403 decoder->control->userdata = (void*)avctx;
405 if ((status = mmal_port_enable(decoder->control, control_port_cb)))
407 if ((status = mmal_port_enable(decoder->input[0], input_callback)))
409 if ((status = mmal_port_enable(decoder->output[0], output_callback)))
412 if ((status = mmal_component_enable(decoder)))
418 ffmmal_close_decoder(avctx);
419 return ret < 0 ? ret : AVERROR_UNKNOWN;
422 static void ffmmal_flush(AVCodecContext *avctx)
424 MMALDecodeContext *ctx = avctx->priv_data;
425 MMAL_COMPONENT_T *decoder = ctx->decoder;
426 MMAL_STATUS_T status;
428 ffmmal_stop_decoder(avctx);
430 if ((status = mmal_port_enable(decoder->control, control_port_cb)))
432 if ((status = mmal_port_enable(decoder->input[0], input_callback)))
434 if ((status = mmal_port_enable(decoder->output[0], output_callback)))
440 av_log(avctx, AV_LOG_ERROR, "MMAL flush error: %i\n", (int)status);
443 // Split packets and add them to the waiting_buffers list. We don't queue them
444 // immediately, because it can happen that the decoder is temporarily blocked
445 // (due to us not reading/returning enough output buffers) and won't accept
446 // new input. (This wouldn't be an issue if MMAL input buffers always were
447 // complete frames - then the input buffer just would have to be big enough.)
448 // If is_extradata is set, send it as MMAL_BUFFER_HEADER_FLAG_CONFIG.
449 static int ffmmal_add_packet(AVCodecContext *avctx, AVPacket *avpkt,
452 MMALDecodeContext *ctx = avctx->priv_data;
453 AVBufferRef *buf = NULL;
455 uint8_t *data = (uint8_t *)"";
461 buf = av_buffer_ref(avpkt->buf);
465 buf = av_buffer_alloc(avpkt->size);
467 memcpy(buf->data, avpkt->data, avpkt->size);
473 ret = AVERROR(ENOMEM);
481 if (!ctx->packets_sent) {
482 // Short-cut the flush logic to avoid upsetting MMAL.
484 ctx->eos_received = 1;
492 FFBufferEntry *buffer = av_mallocz(sizeof(*buffer));
494 ret = AVERROR(ENOMEM);
499 buffer->length = FFMIN(size, ctx->decoder->input[0]->buffer_size);
502 buffer->flags |= MMAL_BUFFER_HEADER_FLAG_CONFIG;
505 buffer->flags |= MMAL_BUFFER_HEADER_FLAG_FRAME_START;
507 data += buffer->length;
508 size -= buffer->length;
510 buffer->pts = avpkt->pts == AV_NOPTS_VALUE ? MMAL_TIME_UNKNOWN : avpkt->pts;
511 buffer->dts = avpkt->dts == AV_NOPTS_VALUE ? MMAL_TIME_UNKNOWN : avpkt->dts;
514 buffer->flags |= MMAL_BUFFER_HEADER_FLAG_FRAME_END;
515 avpriv_atomic_int_add_and_fetch(&ctx->packets_buffered, 1);
518 if (!buffer->length) {
519 buffer->flags |= MMAL_BUFFER_HEADER_FLAG_EOS;
524 buffer->ref = av_buffer_ref(buf);
527 ret = AVERROR(ENOMEM);
532 // Insert at end of the list
533 if (!ctx->waiting_buffers)
534 ctx->waiting_buffers = buffer;
535 if (ctx->waiting_buffers_tail)
536 ctx->waiting_buffers_tail->next = buffer;
537 ctx->waiting_buffers_tail = buffer;
541 av_buffer_unref(&buf);
545 // Move prepared/split packets from waiting_buffers to the MMAL decoder.
546 static int ffmmal_fill_input_port(AVCodecContext *avctx)
548 MMALDecodeContext *ctx = avctx->priv_data;
550 while (ctx->waiting_buffers) {
551 MMAL_BUFFER_HEADER_T *mbuffer;
552 FFBufferEntry *buffer;
553 MMAL_STATUS_T status;
555 mbuffer = mmal_queue_get(ctx->pool_in->queue);
559 buffer = ctx->waiting_buffers;
561 mmal_buffer_header_reset(mbuffer);
563 mbuffer->pts = buffer->pts;
564 mbuffer->dts = buffer->dts;
565 mbuffer->flags = buffer->flags;
566 mbuffer->data = buffer->data;
567 mbuffer->length = buffer->length;
568 mbuffer->user_data = buffer;
569 mbuffer->alloc_size = ctx->decoder->input[0]->buffer_size;
571 // Remove from start of the list
572 ctx->waiting_buffers = buffer->next;
573 if (ctx->waiting_buffers_tail == buffer)
574 ctx->waiting_buffers_tail = NULL;
576 if ((status = mmal_port_send_buffer(ctx->decoder->input[0], mbuffer))) {
577 mmal_buffer_header_release(mbuffer);
578 av_buffer_unref(&buffer->ref);
579 if (buffer->flags & MMAL_BUFFER_HEADER_FLAG_FRAME_END)
580 avpriv_atomic_int_add_and_fetch(&ctx->packets_buffered, -1);
585 av_log(avctx, AV_LOG_ERROR, "MMAL error %d when sending input\n", (int)status);
586 return AVERROR_UNKNOWN;
593 static int ffmal_copy_frame(AVCodecContext *avctx, AVFrame *frame,
594 MMAL_BUFFER_HEADER_T *buffer)
596 MMALDecodeContext *ctx = avctx->priv_data;
599 if (avctx->pix_fmt == AV_PIX_FMT_MMAL) {
601 return AVERROR_UNKNOWN; // format change code failed with OOM previously
603 if ((ret = ff_decode_frame_props(avctx, frame)) < 0)
606 if ((ret = ffmmal_set_ref(frame, ctx->pool_out, buffer)) < 0)
609 int w = FFALIGN(avctx->width, 32);
610 int h = FFALIGN(avctx->height, 16);
615 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
618 ptr = buffer->data + buffer->type->video.offset[0];
619 for (i = 0; i < avctx->height; i++)
620 memcpy(frame->data[0] + frame->linesize[0] * i, ptr + w * i, avctx->width);
624 for (plane = 1; plane < 3; plane++) {
625 for (i = 0; i < avctx->height / 2; i++)
626 memcpy(frame->data[plane] + frame->linesize[plane] * i, ptr + w / 2 * i, (avctx->width + 1) / 2);
627 ptr += w / 2 * h / 2;
631 frame->pkt_pts = buffer->pts == MMAL_TIME_UNKNOWN ? AV_NOPTS_VALUE : buffer->pts;
632 frame->pkt_dts = AV_NOPTS_VALUE;
638 // Fetch a decoded buffer and place it into the frame parameter.
639 static int ffmmal_read_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame)
641 MMALDecodeContext *ctx = avctx->priv_data;
642 MMAL_BUFFER_HEADER_T *buffer = NULL;
643 MMAL_STATUS_T status = 0;
646 if (ctx->eos_received)
650 // To ensure decoding in lockstep with a constant delay between fed packets
651 // and output frames, we always wait until an output buffer is available.
652 // Except during start we don't know after how many input packets the decoder
653 // is going to return the first buffer, and we can't distinguish decoder
654 // being busy from decoder waiting for input. So just poll at the start and
655 // keep feeding new data to the buffer.
656 // We are pretty sure the decoder will produce output if we sent more input
657 // frames than what a h264 decoder could logically delay. This avoids too
658 // excessive buffering.
659 // We also wait if we sent eos, but didn't receive it yet (think of decoding
660 // stream with a very low number of frames).
661 if (avpriv_atomic_int_get(&ctx->packets_buffered) > MAX_DELAYED_FRAMES ||
662 (ctx->packets_sent && ctx->eos_sent)) {
663 // MMAL will ignore broken input packets, which means the frame we
664 // expect here may never arrive. Dealing with this correctly is
665 // complicated, so here's a hack to avoid that it freezes forever
666 // in this unlikely situation.
667 buffer = mmal_queue_timedwait(ctx->queue_decoded_frames, 100);
669 av_log(avctx, AV_LOG_ERROR, "Did not get output frame from MMAL.\n");
670 ret = AVERROR_UNKNOWN;
674 buffer = mmal_queue_get(ctx->queue_decoded_frames);
679 ctx->eos_received |= !!(buffer->flags & MMAL_BUFFER_HEADER_FLAG_EOS);
680 if (ctx->eos_received)
683 if (buffer->cmd == MMAL_EVENT_FORMAT_CHANGED) {
684 MMAL_COMPONENT_T *decoder = ctx->decoder;
685 MMAL_EVENT_FORMAT_CHANGED_T *ev = mmal_event_format_changed_get(buffer);
686 MMAL_BUFFER_HEADER_T *stale_buffer;
688 av_log(avctx, AV_LOG_INFO, "Changing output format.\n");
690 if ((status = mmal_port_disable(decoder->output[0])))
693 while ((stale_buffer = mmal_queue_get(ctx->queue_decoded_frames)))
694 mmal_buffer_header_release(stale_buffer);
696 mmal_format_copy(decoder->output[0]->format, ev->format);
698 if ((ret = ffmal_update_format(avctx)) < 0)
701 if ((status = mmal_port_enable(decoder->output[0], output_callback)))
704 if ((ret = ffmmal_fill_output_port(avctx)) < 0)
707 if ((ret = ffmmal_fill_input_port(avctx)) < 0)
710 mmal_buffer_header_release(buffer);
712 } else if (buffer->cmd) {
714 av_get_codec_tag_string(s, sizeof(s), buffer->cmd);
715 av_log(avctx, AV_LOG_WARNING, "Unknown MMAL event %s on output port\n", s);
717 } else if (buffer->length == 0) {
718 // Unused output buffer that got drained after format change.
719 mmal_buffer_header_release(buffer);
723 ctx->frames_output++;
725 if ((ret = ffmal_copy_frame(avctx, frame, buffer)) < 0)
734 mmal_buffer_header_release(buffer);
735 if (status && ret >= 0)
736 ret = AVERROR_UNKNOWN;
740 static int ffmmal_decode(AVCodecContext *avctx, void *data, int *got_frame,
743 MMALDecodeContext *ctx = avctx->priv_data;
744 AVFrame *frame = data;
747 if (avctx->extradata_size && !ctx->extradata_sent) {
749 av_init_packet(&pkt);
750 pkt.data = avctx->extradata;
751 pkt.size = avctx->extradata_size;
752 ctx->extradata_sent = 1;
753 if ((ret = ffmmal_add_packet(avctx, &pkt, 1)) < 0)
757 if ((ret = ffmmal_add_packet(avctx, avpkt, 0)) < 0)
760 if ((ret = ffmmal_fill_input_port(avctx)) < 0)
763 if ((ret = ffmmal_fill_output_port(avctx)) < 0)
766 if ((ret = ffmmal_read_frame(avctx, frame, got_frame)) < 0)
769 // ffmmal_read_frame() can block for a while. Since the decoder is
770 // asynchronous, it's a good idea to fill the ports again.
772 if ((ret = ffmmal_fill_output_port(avctx)) < 0)
775 if ((ret = ffmmal_fill_input_port(avctx)) < 0)
781 AVHWAccel ff_h264_mmal_hwaccel = {
783 .type = AVMEDIA_TYPE_VIDEO,
784 .id = AV_CODEC_ID_H264,
785 .pix_fmt = AV_PIX_FMT_MMAL,
788 AVHWAccel ff_mpeg2_mmal_hwaccel = {
789 .name = "mpeg2_mmal",
790 .type = AVMEDIA_TYPE_VIDEO,
791 .id = AV_CODEC_ID_MPEG2VIDEO,
792 .pix_fmt = AV_PIX_FMT_MMAL,
795 AVHWAccel ff_vc1_mmal_hwaccel = {
797 .type = AVMEDIA_TYPE_VIDEO,
798 .id = AV_CODEC_ID_VC1,
799 .pix_fmt = AV_PIX_FMT_MMAL,
802 static const AVOption options[]={
803 {"extra_buffers", "extra buffers", offsetof(MMALDecodeContext, extra_buffers), AV_OPT_TYPE_INT, {.i64 = 10}, 0, 256, 0},
807 #define FFMMAL_DEC_CLASS(NAME) \
808 static const AVClass ffmmal_##NAME##_dec_class = { \
809 .class_name = "mmal_" #NAME "_dec", \
811 .version = LIBAVUTIL_VERSION_INT, \
814 #define FFMMAL_DEC(NAME, ID) \
815 FFMMAL_DEC_CLASS(NAME) \
816 AVCodec ff_##NAME##_mmal_decoder = { \
817 .name = #NAME "_mmal", \
818 .long_name = NULL_IF_CONFIG_SMALL(#NAME " (mmal)"), \
819 .type = AVMEDIA_TYPE_VIDEO, \
821 .priv_data_size = sizeof(MMALDecodeContext), \
822 .init = ffmmal_init_decoder, \
823 .close = ffmmal_close_decoder, \
824 .decode = ffmmal_decode, \
825 .flush = ffmmal_flush, \
826 .priv_class = &ffmmal_##NAME##_dec_class, \
827 .capabilities = AV_CODEC_CAP_DELAY, \
828 .caps_internal = FF_CODEC_CAP_SETS_PKT_DTS, \
829 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_MMAL, \
830 AV_PIX_FMT_YUV420P, \
834 FFMMAL_DEC(h264, AV_CODEC_ID_H264)
835 FFMMAL_DEC(mpeg2, AV_CODEC_ID_MPEG2VIDEO)
836 FFMMAL_DEC(vc1, AV_CODEC_ID_VC1)