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>
34 #include <stdatomic.h>
39 #include "libavutil/avassert.h"
40 #include "libavutil/buffer.h"
41 #include "libavutil/common.h"
42 #include "libavutil/imgutils.h"
43 #include "libavutil/opt.h"
44 #include "libavutil/log.h"
46 typedef struct FFBufferEntry {
52 struct FFBufferEntry *next;
55 // MMAL_POOL_T destroys all of its MMAL_BUFFER_HEADER_Ts. If we want correct
56 // refcounting for AVFrames, we can free the MMAL_POOL_T only after all AVFrames
57 // have been unreferenced.
58 typedef struct FFPoolRef {
63 typedef struct FFBufferRef {
64 MMAL_BUFFER_HEADER_T *buffer;
68 typedef struct MMALDecodeContext {
71 int extra_decoder_buffers;
73 MMAL_COMPONENT_T *decoder;
74 MMAL_QUEUE_T *queue_decoded_frames;
78 // Waiting input packets. Because the libavcodec API requires decoding and
79 // returning packets in lockstep, it can happen that queue_decoded_frames
80 // contains almost all surfaces - then the decoder input queue can quickly
81 // fill up and won't accept new input either. Without consuming input, the
82 // libavcodec API can't return new frames, and we have a logical deadlock.
83 // This is avoided by queuing such buffers here.
84 FFBufferEntry *waiting_buffers, *waiting_buffers_tail;
87 atomic_int packets_buffered;
88 int64_t frames_output;
96 // Assume decoder is guaranteed to produce output after at least this many
97 // packets (where each packet contains 1 frame).
98 #define MAX_DELAYED_FRAMES 16
100 static void ffmmal_poolref_unref(FFPoolRef *ref)
103 atomic_fetch_add_explicit(&ref->refcount, -1, memory_order_acq_rel) == 1) {
104 mmal_pool_destroy(ref->pool);
109 static void ffmmal_release_frame(void *opaque, uint8_t *data)
111 FFBufferRef *ref = (void *)data;
113 mmal_buffer_header_release(ref->buffer);
114 ffmmal_poolref_unref(ref->pool);
119 // Setup frame with a new reference to buffer. The buffer must have been
120 // allocated from the given pool.
121 static int ffmmal_set_ref(AVFrame *frame, FFPoolRef *pool,
122 MMAL_BUFFER_HEADER_T *buffer)
124 FFBufferRef *ref = av_mallocz(sizeof(*ref));
126 return AVERROR(ENOMEM);
129 ref->buffer = buffer;
131 frame->buf[0] = av_buffer_create((void *)ref, sizeof(*ref),
132 ffmmal_release_frame, NULL,
133 AV_BUFFER_FLAG_READONLY);
134 if (!frame->buf[0]) {
136 return AVERROR(ENOMEM);
139 atomic_fetch_add_explicit(&ref->pool->refcount, 1, memory_order_relaxed);
140 mmal_buffer_header_acquire(buffer);
142 frame->format = AV_PIX_FMT_MMAL;
143 frame->data[3] = (uint8_t *)ref->buffer;
147 static void ffmmal_stop_decoder(AVCodecContext *avctx)
149 MMALDecodeContext *ctx = avctx->priv_data;
150 MMAL_COMPONENT_T *decoder = ctx->decoder;
151 MMAL_BUFFER_HEADER_T *buffer;
153 mmal_port_disable(decoder->input[0]);
154 mmal_port_disable(decoder->output[0]);
155 mmal_port_disable(decoder->control);
157 mmal_port_flush(decoder->input[0]);
158 mmal_port_flush(decoder->output[0]);
159 mmal_port_flush(decoder->control);
161 while ((buffer = mmal_queue_get(ctx->queue_decoded_frames)))
162 mmal_buffer_header_release(buffer);
164 while (ctx->waiting_buffers) {
165 FFBufferEntry *buffer = ctx->waiting_buffers;
167 ctx->waiting_buffers = buffer->next;
169 if (buffer->flags & MMAL_BUFFER_HEADER_FLAG_FRAME_END)
170 atomic_fetch_add(&ctx->packets_buffered, -1);
172 av_buffer_unref(&buffer->ref);
175 ctx->waiting_buffers_tail = NULL;
177 av_assert0(atomic_load(&ctx->packets_buffered) == 0);
179 ctx->frames_output = ctx->eos_received = ctx->eos_sent = ctx->packets_sent = ctx->extradata_sent = 0;
182 static av_cold int ffmmal_close_decoder(AVCodecContext *avctx)
184 MMALDecodeContext *ctx = avctx->priv_data;
187 ffmmal_stop_decoder(avctx);
189 mmal_component_destroy(ctx->decoder);
191 mmal_queue_destroy(ctx->queue_decoded_frames);
192 mmal_pool_destroy(ctx->pool_in);
193 ffmmal_poolref_unref(ctx->pool_out);
200 static void input_callback(MMAL_PORT_T *port, MMAL_BUFFER_HEADER_T *buffer)
202 AVCodecContext *avctx = (AVCodecContext*)port->userdata;
203 MMALDecodeContext *ctx = avctx->priv_data;
206 FFBufferEntry *entry = buffer->user_data;
207 av_buffer_unref(&entry->ref);
208 if (entry->flags & MMAL_BUFFER_HEADER_FLAG_FRAME_END)
209 atomic_fetch_add(&ctx->packets_buffered, -1);
212 mmal_buffer_header_release(buffer);
215 static void output_callback(MMAL_PORT_T *port, MMAL_BUFFER_HEADER_T *buffer)
217 AVCodecContext *avctx = (AVCodecContext*)port->userdata;
218 MMALDecodeContext *ctx = avctx->priv_data;
220 mmal_queue_put(ctx->queue_decoded_frames, buffer);
223 static void control_port_cb(MMAL_PORT_T *port, MMAL_BUFFER_HEADER_T *buffer)
225 AVCodecContext *avctx = (AVCodecContext*)port->userdata;
226 MMAL_STATUS_T status;
228 if (buffer->cmd == MMAL_EVENT_ERROR) {
229 status = *(uint32_t *)buffer->data;
230 av_log(avctx, AV_LOG_ERROR, "MMAL error %d on control port\n", (int)status);
232 av_log(avctx, AV_LOG_WARNING, "Unknown MMAL event %s on control port\n",
233 av_fourcc2str(buffer->cmd));
236 mmal_buffer_header_release(buffer);
239 // Feed free output buffers to the decoder.
240 static int ffmmal_fill_output_port(AVCodecContext *avctx)
242 MMALDecodeContext *ctx = avctx->priv_data;
243 MMAL_BUFFER_HEADER_T *buffer;
244 MMAL_STATUS_T status;
247 return AVERROR_UNKNOWN; // format change code failed with OOM previously
249 while ((buffer = mmal_queue_get(ctx->pool_out->pool->queue))) {
250 if ((status = mmal_port_send_buffer(ctx->decoder->output[0], buffer))) {
251 mmal_buffer_header_release(buffer);
252 av_log(avctx, AV_LOG_ERROR, "MMAL error %d when sending output buffer.\n", (int)status);
253 return AVERROR_UNKNOWN;
260 static enum AVColorSpace ffmmal_csp_to_av_csp(MMAL_FOURCC_T fourcc)
263 case MMAL_COLOR_SPACE_BT470_2_BG:
264 case MMAL_COLOR_SPACE_BT470_2_M:
265 case MMAL_COLOR_SPACE_ITUR_BT601: return AVCOL_SPC_BT470BG;
266 case MMAL_COLOR_SPACE_ITUR_BT709: return AVCOL_SPC_BT709;
267 case MMAL_COLOR_SPACE_FCC: return AVCOL_SPC_FCC;
268 case MMAL_COLOR_SPACE_SMPTE240M: return AVCOL_SPC_SMPTE240M;
269 default: return AVCOL_SPC_UNSPECIFIED;
273 static int ffmal_update_format(AVCodecContext *avctx)
275 MMALDecodeContext *ctx = avctx->priv_data;
276 MMAL_STATUS_T status;
278 MMAL_COMPONENT_T *decoder = ctx->decoder;
279 MMAL_ES_FORMAT_T *format_out = decoder->output[0]->format;
280 MMAL_PARAMETER_VIDEO_INTERLACE_TYPE_T interlace_type;
282 ffmmal_poolref_unref(ctx->pool_out);
283 if (!(ctx->pool_out = av_mallocz(sizeof(*ctx->pool_out)))) {
284 ret = AVERROR(ENOMEM);
287 atomic_init(&ctx->pool_out->refcount, 1);
292 if ((status = mmal_port_parameter_set_uint32(decoder->output[0], MMAL_PARAMETER_EXTRA_BUFFERS, ctx->extra_buffers)))
295 if ((status = mmal_port_parameter_set_boolean(decoder->output[0], MMAL_PARAMETER_VIDEO_INTERPOLATE_TIMESTAMPS, 0)))
298 if (avctx->pix_fmt == AV_PIX_FMT_MMAL) {
299 format_out->encoding = MMAL_ENCODING_OPAQUE;
301 format_out->encoding_variant = format_out->encoding = MMAL_ENCODING_I420;
304 if ((status = mmal_port_format_commit(decoder->output[0])))
307 interlace_type.hdr.id = MMAL_PARAMETER_VIDEO_INTERLACE_TYPE;
308 interlace_type.hdr.size = sizeof(MMAL_PARAMETER_VIDEO_INTERLACE_TYPE_T);
309 status = mmal_port_parameter_get(decoder->output[0], &interlace_type.hdr);
310 if (status != MMAL_SUCCESS) {
311 av_log(avctx, AV_LOG_ERROR, "Cannot read MMAL interlace information!\n");
313 ctx->interlaced_frame = (interlace_type.eMode != MMAL_InterlaceProgressive);
314 ctx->top_field_first = (interlace_type.eMode == MMAL_InterlaceFieldsInterleavedUpperFirst);
317 if ((ret = ff_set_dimensions(avctx, format_out->es->video.crop.x + format_out->es->video.crop.width,
318 format_out->es->video.crop.y + format_out->es->video.crop.height)) < 0)
321 if (format_out->es->video.par.num && format_out->es->video.par.den) {
322 avctx->sample_aspect_ratio.num = format_out->es->video.par.num;
323 avctx->sample_aspect_ratio.den = format_out->es->video.par.den;
325 if (format_out->es->video.frame_rate.num && format_out->es->video.frame_rate.den) {
326 avctx->framerate.num = format_out->es->video.frame_rate.num;
327 avctx->framerate.den = format_out->es->video.frame_rate.den;
330 avctx->colorspace = ffmmal_csp_to_av_csp(format_out->es->video.color_space);
332 decoder->output[0]->buffer_size =
333 FFMAX(decoder->output[0]->buffer_size_min, decoder->output[0]->buffer_size_recommended);
334 decoder->output[0]->buffer_num =
335 FFMAX(decoder->output[0]->buffer_num_min, decoder->output[0]->buffer_num_recommended) + ctx->extra_buffers;
336 ctx->pool_out->pool = mmal_pool_create(decoder->output[0]->buffer_num,
337 decoder->output[0]->buffer_size);
338 if (!ctx->pool_out->pool) {
339 ret = AVERROR(ENOMEM);
346 return ret < 0 ? ret : AVERROR_UNKNOWN;
349 static av_cold int ffmmal_init_decoder(AVCodecContext *avctx)
351 MMALDecodeContext *ctx = avctx->priv_data;
352 MMAL_STATUS_T status;
353 MMAL_ES_FORMAT_T *format_in;
354 MMAL_COMPONENT_T *decoder;
359 if (mmal_vc_init()) {
360 av_log(avctx, AV_LOG_ERROR, "Cannot initialize MMAL VC driver!\n");
361 return AVERROR(ENOSYS);
364 if ((ret = ff_get_format(avctx, avctx->codec->pix_fmts)) < 0)
367 avctx->pix_fmt = ret;
369 if ((status = mmal_component_create(MMAL_COMPONENT_DEFAULT_VIDEO_DECODER, &ctx->decoder)))
372 decoder = ctx->decoder;
374 format_in = decoder->input[0]->format;
375 format_in->type = MMAL_ES_TYPE_VIDEO;
376 switch (avctx->codec_id) {
377 case AV_CODEC_ID_MPEG2VIDEO:
378 format_in->encoding = MMAL_ENCODING_MP2V;
380 case AV_CODEC_ID_MPEG4:
381 format_in->encoding = MMAL_ENCODING_MP4V;
383 case AV_CODEC_ID_VC1:
384 format_in->encoding = MMAL_ENCODING_WVC1;
386 case AV_CODEC_ID_H264:
388 format_in->encoding = MMAL_ENCODING_H264;
391 format_in->es->video.width = FFALIGN(avctx->width, 32);
392 format_in->es->video.height = FFALIGN(avctx->height, 16);
393 format_in->es->video.crop.width = avctx->width;
394 format_in->es->video.crop.height = avctx->height;
395 format_in->es->video.frame_rate.num = 24000;
396 format_in->es->video.frame_rate.den = 1001;
397 format_in->es->video.par.num = avctx->sample_aspect_ratio.num;
398 format_in->es->video.par.den = avctx->sample_aspect_ratio.den;
399 format_in->flags = MMAL_ES_FORMAT_FLAG_FRAMED;
401 av_log(avctx, AV_LOG_DEBUG, "Using MMAL %s encoding.\n",
402 av_fourcc2str(format_in->encoding));
404 #if HAVE_MMAL_PARAMETER_VIDEO_MAX_NUM_CALLBACKS
405 if (mmal_port_parameter_set_uint32(decoder->input[0], MMAL_PARAMETER_VIDEO_MAX_NUM_CALLBACKS,
406 -1 - ctx->extra_decoder_buffers)) {
407 av_log(avctx, AV_LOG_WARNING, "Could not set input buffering limit.\n");
411 if ((status = mmal_port_format_commit(decoder->input[0])))
414 decoder->input[0]->buffer_num =
415 FFMAX(decoder->input[0]->buffer_num_min, 20);
416 decoder->input[0]->buffer_size =
417 FFMAX(decoder->input[0]->buffer_size_min, 512 * 1024);
418 ctx->pool_in = mmal_pool_create(decoder->input[0]->buffer_num, 0);
420 ret = AVERROR(ENOMEM);
424 if ((ret = ffmal_update_format(avctx)) < 0)
427 ctx->queue_decoded_frames = mmal_queue_create();
428 if (!ctx->queue_decoded_frames)
431 decoder->input[0]->userdata = (void*)avctx;
432 decoder->output[0]->userdata = (void*)avctx;
433 decoder->control->userdata = (void*)avctx;
435 if ((status = mmal_port_enable(decoder->control, control_port_cb)))
437 if ((status = mmal_port_enable(decoder->input[0], input_callback)))
439 if ((status = mmal_port_enable(decoder->output[0], output_callback)))
442 if ((status = mmal_component_enable(decoder)))
448 ffmmal_close_decoder(avctx);
449 return ret < 0 ? ret : AVERROR_UNKNOWN;
452 static void ffmmal_flush(AVCodecContext *avctx)
454 MMALDecodeContext *ctx = avctx->priv_data;
455 MMAL_COMPONENT_T *decoder = ctx->decoder;
456 MMAL_STATUS_T status;
458 ffmmal_stop_decoder(avctx);
460 if ((status = mmal_port_enable(decoder->control, control_port_cb)))
462 if ((status = mmal_port_enable(decoder->input[0], input_callback)))
464 if ((status = mmal_port_enable(decoder->output[0], output_callback)))
470 av_log(avctx, AV_LOG_ERROR, "MMAL flush error: %i\n", (int)status);
473 // Split packets and add them to the waiting_buffers list. We don't queue them
474 // immediately, because it can happen that the decoder is temporarily blocked
475 // (due to us not reading/returning enough output buffers) and won't accept
476 // new input. (This wouldn't be an issue if MMAL input buffers always were
477 // complete frames - then the input buffer just would have to be big enough.)
478 // If is_extradata is set, send it as MMAL_BUFFER_HEADER_FLAG_CONFIG.
479 static int ffmmal_add_packet(AVCodecContext *avctx, AVPacket *avpkt,
482 MMALDecodeContext *ctx = avctx->priv_data;
483 AVBufferRef *buf = NULL;
485 uint8_t *data = (uint8_t *)"";
491 buf = av_buffer_ref(avpkt->buf);
495 buf = av_buffer_alloc(avpkt->size);
497 memcpy(buf->data, avpkt->data, avpkt->size);
503 ret = AVERROR(ENOMEM);
511 if (!ctx->packets_sent) {
512 // Short-cut the flush logic to avoid upsetting MMAL.
514 ctx->eos_received = 1;
522 FFBufferEntry *buffer = av_mallocz(sizeof(*buffer));
524 ret = AVERROR(ENOMEM);
529 buffer->length = FFMIN(size, ctx->decoder->input[0]->buffer_size);
532 buffer->flags |= MMAL_BUFFER_HEADER_FLAG_CONFIG;
535 buffer->flags |= MMAL_BUFFER_HEADER_FLAG_FRAME_START;
537 data += buffer->length;
538 size -= buffer->length;
540 buffer->pts = avpkt->pts == AV_NOPTS_VALUE ? MMAL_TIME_UNKNOWN : avpkt->pts;
541 buffer->dts = avpkt->dts == AV_NOPTS_VALUE ? MMAL_TIME_UNKNOWN : avpkt->dts;
544 buffer->flags |= MMAL_BUFFER_HEADER_FLAG_FRAME_END;
545 atomic_fetch_add(&ctx->packets_buffered, 1);
548 if (!buffer->length) {
549 buffer->flags |= MMAL_BUFFER_HEADER_FLAG_EOS;
554 buffer->ref = av_buffer_ref(buf);
557 ret = AVERROR(ENOMEM);
562 // Insert at end of the list
563 if (!ctx->waiting_buffers)
564 ctx->waiting_buffers = buffer;
565 if (ctx->waiting_buffers_tail)
566 ctx->waiting_buffers_tail->next = buffer;
567 ctx->waiting_buffers_tail = buffer;
571 av_buffer_unref(&buf);
575 // Move prepared/split packets from waiting_buffers to the MMAL decoder.
576 static int ffmmal_fill_input_port(AVCodecContext *avctx)
578 MMALDecodeContext *ctx = avctx->priv_data;
580 while (ctx->waiting_buffers) {
581 MMAL_BUFFER_HEADER_T *mbuffer;
582 FFBufferEntry *buffer;
583 MMAL_STATUS_T status;
585 mbuffer = mmal_queue_get(ctx->pool_in->queue);
589 buffer = ctx->waiting_buffers;
591 mmal_buffer_header_reset(mbuffer);
593 mbuffer->pts = buffer->pts;
594 mbuffer->dts = buffer->dts;
595 mbuffer->flags = buffer->flags;
596 mbuffer->data = buffer->data;
597 mbuffer->length = buffer->length;
598 mbuffer->user_data = buffer;
599 mbuffer->alloc_size = ctx->decoder->input[0]->buffer_size;
601 // Remove from start of the list
602 ctx->waiting_buffers = buffer->next;
603 if (ctx->waiting_buffers_tail == buffer)
604 ctx->waiting_buffers_tail = NULL;
606 if ((status = mmal_port_send_buffer(ctx->decoder->input[0], mbuffer))) {
607 mmal_buffer_header_release(mbuffer);
608 av_buffer_unref(&buffer->ref);
609 if (buffer->flags & MMAL_BUFFER_HEADER_FLAG_FRAME_END)
610 atomic_fetch_add(&ctx->packets_buffered, -1);
615 av_log(avctx, AV_LOG_ERROR, "MMAL error %d when sending input\n", (int)status);
616 return AVERROR_UNKNOWN;
623 static int ffmal_copy_frame(AVCodecContext *avctx, AVFrame *frame,
624 MMAL_BUFFER_HEADER_T *buffer)
626 MMALDecodeContext *ctx = avctx->priv_data;
629 frame->interlaced_frame = ctx->interlaced_frame;
630 frame->top_field_first = ctx->top_field_first;
632 if (avctx->pix_fmt == AV_PIX_FMT_MMAL) {
634 return AVERROR_UNKNOWN; // format change code failed with OOM previously
636 if ((ret = ff_decode_frame_props(avctx, frame)) < 0)
639 if ((ret = ffmmal_set_ref(frame, ctx->pool_out, buffer)) < 0)
642 int w = FFALIGN(avctx->width, 32);
643 int h = FFALIGN(avctx->height, 16);
647 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
650 av_image_fill_arrays(src, linesize,
651 buffer->data + buffer->type->video.offset[0],
652 avctx->pix_fmt, w, h, 1);
653 av_image_copy(frame->data, frame->linesize, src, linesize,
654 avctx->pix_fmt, avctx->width, avctx->height);
657 frame->pts = buffer->pts == MMAL_TIME_UNKNOWN ? AV_NOPTS_VALUE : buffer->pts;
659 FF_DISABLE_DEPRECATION_WARNINGS
660 frame->pkt_pts = frame->pts;
661 FF_ENABLE_DEPRECATION_WARNINGS
663 frame->pkt_dts = AV_NOPTS_VALUE;
669 // Fetch a decoded buffer and place it into the frame parameter.
670 static int ffmmal_read_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame)
672 MMALDecodeContext *ctx = avctx->priv_data;
673 MMAL_BUFFER_HEADER_T *buffer = NULL;
674 MMAL_STATUS_T status = 0;
677 if (ctx->eos_received)
681 // To ensure decoding in lockstep with a constant delay between fed packets
682 // and output frames, we always wait until an output buffer is available.
683 // Except during start we don't know after how many input packets the decoder
684 // is going to return the first buffer, and we can't distinguish decoder
685 // being busy from decoder waiting for input. So just poll at the start and
686 // keep feeding new data to the buffer.
687 // We are pretty sure the decoder will produce output if we sent more input
688 // frames than what a H.264 decoder could logically delay. This avoids too
689 // excessive buffering.
690 // We also wait if we sent eos, but didn't receive it yet (think of decoding
691 // stream with a very low number of frames).
692 if (atomic_load(&ctx->packets_buffered) > MAX_DELAYED_FRAMES ||
693 (ctx->packets_sent && ctx->eos_sent)) {
694 // MMAL will ignore broken input packets, which means the frame we
695 // expect here may never arrive. Dealing with this correctly is
696 // complicated, so here's a hack to avoid that it freezes forever
697 // in this unlikely situation.
698 buffer = mmal_queue_timedwait(ctx->queue_decoded_frames, 100);
700 av_log(avctx, AV_LOG_ERROR, "Did not get output frame from MMAL.\n");
701 ret = AVERROR_UNKNOWN;
705 buffer = mmal_queue_get(ctx->queue_decoded_frames);
710 ctx->eos_received |= !!(buffer->flags & MMAL_BUFFER_HEADER_FLAG_EOS);
711 if (ctx->eos_received)
714 if (buffer->cmd == MMAL_EVENT_FORMAT_CHANGED) {
715 MMAL_COMPONENT_T *decoder = ctx->decoder;
716 MMAL_EVENT_FORMAT_CHANGED_T *ev = mmal_event_format_changed_get(buffer);
717 MMAL_BUFFER_HEADER_T *stale_buffer;
719 av_log(avctx, AV_LOG_INFO, "Changing output format.\n");
721 if ((status = mmal_port_disable(decoder->output[0])))
724 while ((stale_buffer = mmal_queue_get(ctx->queue_decoded_frames)))
725 mmal_buffer_header_release(stale_buffer);
727 mmal_format_copy(decoder->output[0]->format, ev->format);
729 if ((ret = ffmal_update_format(avctx)) < 0)
732 if ((status = mmal_port_enable(decoder->output[0], output_callback)))
735 if ((ret = ffmmal_fill_output_port(avctx)) < 0)
738 if ((ret = ffmmal_fill_input_port(avctx)) < 0)
741 mmal_buffer_header_release(buffer);
743 } else if (buffer->cmd) {
744 av_log(avctx, AV_LOG_WARNING, "Unknown MMAL event %s on output port\n",
745 av_fourcc2str(buffer->cmd));
747 } else if (buffer->length == 0) {
748 // Unused output buffer that got drained after format change.
749 mmal_buffer_header_release(buffer);
753 ctx->frames_output++;
755 if ((ret = ffmal_copy_frame(avctx, frame, buffer)) < 0)
764 mmal_buffer_header_release(buffer);
765 if (status && ret >= 0)
766 ret = AVERROR_UNKNOWN;
770 static int ffmmal_decode(AVCodecContext *avctx, void *data, int *got_frame,
773 MMALDecodeContext *ctx = avctx->priv_data;
774 AVFrame *frame = data;
777 if (avctx->extradata_size && !ctx->extradata_sent) {
779 av_init_packet(&pkt);
780 pkt.data = avctx->extradata;
781 pkt.size = avctx->extradata_size;
782 ctx->extradata_sent = 1;
783 if ((ret = ffmmal_add_packet(avctx, &pkt, 1)) < 0)
787 if ((ret = ffmmal_add_packet(avctx, avpkt, 0)) < 0)
790 if ((ret = ffmmal_fill_input_port(avctx)) < 0)
793 if ((ret = ffmmal_fill_output_port(avctx)) < 0)
796 if ((ret = ffmmal_read_frame(avctx, frame, got_frame)) < 0)
799 // ffmmal_read_frame() can block for a while. Since the decoder is
800 // asynchronous, it's a good idea to fill the ports again.
802 if ((ret = ffmmal_fill_output_port(avctx)) < 0)
805 if ((ret = ffmmal_fill_input_port(avctx)) < 0)
811 static const AVCodecHWConfigInternal *mmal_hw_configs[] = {
812 HW_CONFIG_INTERNAL(MMAL),
816 static const AVOption options[]={
817 {"extra_buffers", "extra buffers", offsetof(MMALDecodeContext, extra_buffers), AV_OPT_TYPE_INT, {.i64 = 10}, 0, 256, 0},
818 {"extra_decoder_buffers", "extra MMAL internal buffered frames", offsetof(MMALDecodeContext, extra_decoder_buffers), AV_OPT_TYPE_INT, {.i64 = 10}, 0, 256, 0},
822 #define FFMMAL_DEC_CLASS(NAME) \
823 static const AVClass ffmmal_##NAME##_dec_class = { \
824 .class_name = "mmal_" #NAME "_dec", \
825 .item_name = av_default_item_name, \
827 .version = LIBAVUTIL_VERSION_INT, \
830 #define FFMMAL_DEC(NAME, ID) \
831 FFMMAL_DEC_CLASS(NAME) \
832 AVCodec ff_##NAME##_mmal_decoder = { \
833 .name = #NAME "_mmal", \
834 .long_name = NULL_IF_CONFIG_SMALL(#NAME " (mmal)"), \
835 .type = AVMEDIA_TYPE_VIDEO, \
837 .priv_data_size = sizeof(MMALDecodeContext), \
838 .init = ffmmal_init_decoder, \
839 .close = ffmmal_close_decoder, \
840 .decode = ffmmal_decode, \
841 .flush = ffmmal_flush, \
842 .priv_class = &ffmmal_##NAME##_dec_class, \
843 .capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_HARDWARE, \
844 .caps_internal = FF_CODEC_CAP_SETS_PKT_DTS, \
845 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_MMAL, \
846 AV_PIX_FMT_YUV420P, \
848 .hw_configs = mmal_hw_configs, \
849 .wrapper_name = "mmal", \
852 FFMMAL_DEC(h264, AV_CODEC_ID_H264)
853 FFMMAL_DEC(mpeg2, AV_CODEC_ID_MPEG2VIDEO)
854 FFMMAL_DEC(mpeg4, AV_CODEC_ID_MPEG4)
855 FFMMAL_DEC(vc1, AV_CODEC_ID_VC1)